diff --git a/README.md b/README.md
index f043f59..5b19751 100644
--- a/README.md
+++ b/README.md
@@ -8,13 +8,13 @@
 
 ## Features
 
-- Build static HTML files from Markdown files.
-    - Turn a single Markdown file into a HTML slideshow.
-    - Turn a folder with Markdown files into a collection of HTML slideshows.
-- Publish your slideshow(s) anywhere that static files can be served.
-- Preview your site as you work, thanks to [python-livereload](https://pypi.org/project/livereload/).
-- Use custom favicons, CSS themes, templates, ... if desired.
-- And more!
+-   Build static HTML files from Markdown files.
+    -   Turn a single Markdown file into a HTML slideshow.
+    -   Turn a folder with Markdown files into a collection of HTML slideshows.
+-   Publish your slideshow(s) anywhere that static files can be served.
+-   Preview your site as you work, thanks to [python-livereload](https://pypi.org/project/livereload/).
+-   Use custom favicons, CSS themes, templates, ... if desired.
+-   And more!
 
 ## Example
 
@@ -53,3 +53,39 @@ mkslides-reveal serve docs/
 ```bash
 mkslides-reveal serve test.md
 ```
+
+## Configuration
+
+Just create a `mkslides.yml`. All options are optional, you only have to add what you want to change to `mkslides.yml`.
+
+Here's an example:
+
+```yml
+index:
+    title: example-title
+    favicon: ./example-index-favicon.ico
+    theme: example-index-theme.css
+slides:
+    favicon: ./example-slides-favicon.ico
+    theme: example-slides-theme.css
+    highlight_theme: example-slides-highlight-theme.css
+    separator: ^\s*---\s*$
+    separator_vertical: ^\s*-v-\s*$
+    separator_notes: "^Notes?:"
+    separator_charset: utf-8
+reveal.js:
+    height: 1080
+    width: 1920
+    transition: fade
+plugins:
+    - name: RevealMermaid
+      extra_javascript:
+          - https://cdn.jsdelivr.net/npm/reveal.js-mermaid-plugin/plugin/mermaid/mermaid.min.js
+    - extra_javascript:
+          - https://cdn.jsdelivr.net/npm/reveal-plantuml/dist/reveal-plantuml.min.js
+```
+
+-   `favicon`and `theme`, can also be configured as an URL, e.g. `https://example.org/theme.css`.
+-   `theme` can also be configured as a [Reveal.js built-in theme](https://revealjs.com/themes/), e.g. `black`, `white`, `league`, `solarized`, `dracula`, ... .
+-   `highlight_theme` can also be configured as a [highlight.js built-in theme](https://highlightjs.org/examples), e.g. `monokai`, `obsidian`, `tokyo-night-dark`, `vs`, ... .
+-   `reveal.js` can contain all [Reveal.js options](https://revealjs.com/config/).
diff --git a/poetry.lock b/poetry.lock
index b1517af..b31ed50 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,49 +1,5 @@
 # This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
-[[package]]
-name = "black"
-version = "24.8.0"
-description = "The uncompromising code formatter."
-optional = false
-python-versions = ">=3.8"
-files = [
-    {file = "black-24.8.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:09cdeb74d494ec023ded657f7092ba518e8cf78fa8386155e4a03fdcc44679e6"},
-    {file = "black-24.8.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:81c6742da39f33b08e791da38410f32e27d632260e599df7245cccee2064afeb"},
-    {file = "black-24.8.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:707a1ca89221bc8a1a64fb5e15ef39cd755633daa672a9db7498d1c19de66a42"},
-    {file = "black-24.8.0-cp310-cp310-win_amd64.whl", hash = "sha256:d6417535d99c37cee4091a2f24eb2b6d5ec42b144d50f1f2e436d9fe1916fe1a"},
-    {file = "black-24.8.0-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:fb6e2c0b86bbd43dee042e48059c9ad7830abd5c94b0bc518c0eeec57c3eddc1"},
-    {file = "black-24.8.0-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:837fd281f1908d0076844bc2b801ad2d369c78c45cf800cad7b61686051041af"},
-    {file = "black-24.8.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:62e8730977f0b77998029da7971fa896ceefa2c4c4933fcd593fa599ecbf97a4"},
-    {file = "black-24.8.0-cp311-cp311-win_amd64.whl", hash = "sha256:72901b4913cbac8972ad911dc4098d5753704d1f3c56e44ae8dce99eecb0e3af"},
-    {file = "black-24.8.0-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:7c046c1d1eeb7aea9335da62472481d3bbf3fd986e093cffd35f4385c94ae368"},
-    {file = "black-24.8.0-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:649f6d84ccbae73ab767e206772cc2d7a393a001070a4c814a546afd0d423aed"},
-    {file = "black-24.8.0-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:2b59b250fdba5f9a9cd9d0ece6e6d993d91ce877d121d161e4698af3eb9c1018"},
-    {file = "black-24.8.0-cp312-cp312-win_amd64.whl", hash = "sha256:6e55d30d44bed36593c3163b9bc63bf58b3b30e4611e4d88a0c3c239930ed5b2"},
-    {file = "black-24.8.0-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:505289f17ceda596658ae81b61ebbe2d9b25aa78067035184ed0a9d855d18afd"},
-    {file = "black-24.8.0-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:b19c9ad992c7883ad84c9b22aaa73562a16b819c1d8db7a1a1a49fb7ec13c7d2"},
-    {file = "black-24.8.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:1f13f7f386f86f8121d76599114bb8c17b69d962137fc70efe56137727c7047e"},
-    {file = "black-24.8.0-cp38-cp38-win_amd64.whl", hash = "sha256:f490dbd59680d809ca31efdae20e634f3fae27fba3ce0ba3208333b713bc3920"},
-    {file = "black-24.8.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:eab4dd44ce80dea27dc69db40dab62d4ca96112f87996bca68cd75639aeb2e4c"},
-    {file = "black-24.8.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:3c4285573d4897a7610054af5a890bde7c65cb466040c5f0c8b732812d7f0e5e"},
-    {file = "black-24.8.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:9e84e33b37be070ba135176c123ae52a51f82306def9f7d063ee302ecab2cf47"},
-    {file = "black-24.8.0-cp39-cp39-win_amd64.whl", hash = "sha256:73bbf84ed136e45d451a260c6b73ed674652f90a2b3211d6a35e78054563a9bb"},
-    {file = "black-24.8.0-py3-none-any.whl", hash = "sha256:972085c618ee94f402da1af548a4f218c754ea7e5dc70acb168bfaca4c2542ed"},
-    {file = "black-24.8.0.tar.gz", hash = "sha256:2500945420b6784c38b9ee885af039f5e7471ef284ab03fa35ecdde4688cd83f"},
-]
-
-[package.dependencies]
-click = ">=8.0.0"
-mypy-extensions = ">=0.4.3"
-packaging = ">=22.0"
-pathspec = ">=0.9.0"
-platformdirs = ">=2"
-
-[package.extras]
-colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.7.4)", "aiohttp (>=3.7.4,!=3.9.0)"]
-jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
-uvloop = ["uvloop (>=0.15.2)"]
-
 [[package]]
 name = "bumpver"
 version = "2023.1129"
@@ -323,33 +279,6 @@ files = [
     {file = "packaging-24.1.tar.gz", hash = "sha256:026ed72c8ed3fcce5bf8950572258698927fd1dbda10a5e981cdf0ac37f4f002"},
 ]
 
-[[package]]
-name = "pathspec"
-version = "0.12.1"
-description = "Utility library for gitignore style pattern matching of file paths."
-optional = false
-python-versions = ">=3.8"
-files = [
-    {file = "pathspec-0.12.1-py3-none-any.whl", hash = "sha256:a0d503e138a4c123b27490a4f7beda6a01c6f288df0e4a8b79c7eb0dc7b4cc08"},
-    {file = "pathspec-0.12.1.tar.gz", hash = "sha256:a482d51503a1ab33b1c67a6c3813a26953dbdc71c31dacaef9a838c4e29f5712"},
-]
-
-[[package]]
-name = "platformdirs"
-version = "4.3.2"
-description = "A small Python package for determining appropriate platform-specific dirs, e.g. a `user data dir`."
-optional = false
-python-versions = ">=3.8"
-files = [
-    {file = "platformdirs-4.3.2-py3-none-any.whl", hash = "sha256:eb1c8582560b34ed4ba105009a4badf7f6f85768b30126f351328507b2beb617"},
-    {file = "platformdirs-4.3.2.tar.gz", hash = "sha256:9e5e27a08aa095dd127b9f2e764d74254f482fef22b0970773bfba79d091ab8c"},
-]
-
-[package.extras]
-docs = ["furo (>=2024.8.6)", "proselint (>=0.14)", "sphinx (>=8.0.2)", "sphinx-autodoc-typehints (>=2.4)"]
-test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=8.3.2)", "pytest-cov (>=5)", "pytest-mock (>=3.14)"]
-type = ["mypy (>=1.11.2)"]
-
 [[package]]
 name = "pluggy"
 version = "1.5.0"
@@ -497,6 +426,33 @@ pygments = ">=2.13.0,<3.0.0"
 [package.extras]
 jupyter = ["ipywidgets (>=7.5.1,<9)"]
 
+[[package]]
+name = "ruff"
+version = "0.6.4"
+description = "An extremely fast Python linter and code formatter, written in Rust."
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "ruff-0.6.4-py3-none-linux_armv6l.whl", hash = "sha256:c4b153fc152af51855458e79e835fb6b933032921756cec9af7d0ba2aa01a258"},
+    {file = "ruff-0.6.4-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:bedff9e4f004dad5f7f76a9d39c4ca98af526c9b1695068198b3bda8c085ef60"},
+    {file = "ruff-0.6.4-py3-none-macosx_11_0_arm64.whl", hash = "sha256:d02a4127a86de23002e694d7ff19f905c51e338c72d8e09b56bfb60e1681724f"},
+    {file = "ruff-0.6.4-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:7862f42fc1a4aca1ea3ffe8a11f67819d183a5693b228f0bb3a531f5e40336fc"},
+    {file = "ruff-0.6.4-py3-none-manylinux_2_17_armv7l.manylinux2014_armv7l.whl", hash = "sha256:eebe4ff1967c838a1a9618a5a59a3b0a00406f8d7eefee97c70411fefc353617"},
+    {file = "ruff-0.6.4-py3-none-manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:932063a03bac394866683e15710c25b8690ccdca1cf192b9a98260332ca93408"},
+    {file = "ruff-0.6.4-py3-none-manylinux_2_17_ppc64.manylinux2014_ppc64.whl", hash = "sha256:50e30b437cebef547bd5c3edf9ce81343e5dd7c737cb36ccb4fe83573f3d392e"},
+    {file = "ruff-0.6.4-py3-none-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:c44536df7b93a587de690e124b89bd47306fddd59398a0fb12afd6133c7b3818"},
+    {file = "ruff-0.6.4-py3-none-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:0ea086601b22dc5e7693a78f3fcfc460cceabfdf3bdc36dc898792aba48fbad6"},
+    {file = "ruff-0.6.4-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:0b52387d3289ccd227b62102c24714ed75fbba0b16ecc69a923a37e3b5e0aaaa"},
+    {file = "ruff-0.6.4-py3-none-musllinux_1_2_aarch64.whl", hash = "sha256:0308610470fcc82969082fc83c76c0d362f562e2f0cdab0586516f03a4e06ec6"},
+    {file = "ruff-0.6.4-py3-none-musllinux_1_2_armv7l.whl", hash = "sha256:803b96dea21795a6c9d5bfa9e96127cc9c31a1987802ca68f35e5c95aed3fc0d"},
+    {file = "ruff-0.6.4-py3-none-musllinux_1_2_i686.whl", hash = "sha256:66dbfea86b663baab8fcae56c59f190caba9398df1488164e2df53e216248baa"},
+    {file = "ruff-0.6.4-py3-none-musllinux_1_2_x86_64.whl", hash = "sha256:34d5efad480193c046c86608dbba2bccdc1c5fd11950fb271f8086e0c763a5d1"},
+    {file = "ruff-0.6.4-py3-none-win32.whl", hash = "sha256:f0f8968feea5ce3777c0d8365653d5e91c40c31a81d95824ba61d871a11b8523"},
+    {file = "ruff-0.6.4-py3-none-win_amd64.whl", hash = "sha256:549daccee5227282289390b0222d0fbee0275d1db6d514550d65420053021a58"},
+    {file = "ruff-0.6.4-py3-none-win_arm64.whl", hash = "sha256:ac4b75e898ed189b3708c9ab3fc70b79a433219e1e87193b4f2b77251d058d14"},
+    {file = "ruff-0.6.4.tar.gz", hash = "sha256:ac3b5bfbee99973f80aa1b7cbd1c9cbce200883bdd067300c22a6cc1c7fba212"},
+]
+
 [[package]]
 name = "toml"
 version = "0.10.2"
@@ -553,4 +509,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.12"
-content-hash = "fd2d6d1ef3eb918ac53a6d091e0f2014d281a5e953840fa49fe458774895ea8e"
+content-hash = "1e951513746db3a7eb530ddd9f6f20dadfbd78a57de9400e8a19cd05113353b8"
diff --git a/pyproject.toml b/pyproject.toml
index ed0af60..8d0b424 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,9 +20,9 @@ click = "^8.1.7"
 
 [tool.poetry.group.dev.dependencies]
 bumpver = "^2023.1129"
-black = "^24.8.0"
 mypy = "^1.11.2"
 types-pyyaml = "^6.0.12.20240808"
+ruff = "^0.6.4"
 
 
 [tool.poetry.group.test.dependencies]
@@ -50,3 +50,24 @@ push = true
 [tool.bumpver.file_patterns]
 "src/mkslides_reveal/__init__.py" = ['^__version__ = "{version}"']
 "pyproject.toml" = ['^version = "{version}"', '^current_version = "{version}"']
+
+[tool.ruff.lint]
+ignore = [
+    "ANN401",  # Dynamically typed expressions (typing.Any) are disallowed
+    "D100",    # Missing docstring in public module
+    "D101",    # Missing docstring in public class
+    "D103",    # Missing docstring in public function
+    "D102",    # Missing docstring in public method
+    "D104",    # Missing docstring in public package"
+    "D107",    # Missing docstring in `__init__`
+    "E501",    # Line too long
+    "FA102",   # Missing `from __future__ import annotations`, but uses PEP 585 collection
+    "G004",    # Logging statement uses f-string"
+    "PLR0913", #  Too many arguments in function definition
+    "RET504",  # Unnecessary assignment to `...` before `return` statement
+    "S101",    # Use of `assert` detected
+    "TD002",   # Missing author in TODO; try: `# TODO(<author_name>): ...` or `# TODO @<author_name>: ...`
+    "TD003",   # Missing issue link on the line following this TODO
+
+]
+select = ["ALL"]
diff --git a/src/mkslides_reveal/__init__.py b/src/mkslides_reveal/__init__.py
index cb8be20..fb69db9 100644
--- a/src/mkslides_reveal/__init__.py
+++ b/src/mkslides_reveal/__init__.py
@@ -1,3 +1 @@
-#!/usr/bin/env python
-
 __version__ = "0.1.14"
diff --git a/src/mkslides_reveal/__main__.py b/src/mkslides_reveal/__main__.py
index 4e314c7..f2f5b26 100644
--- a/src/mkslides_reveal/__main__.py
+++ b/src/mkslides_reveal/__main__.py
@@ -1,27 +1,24 @@
-#!/usr/bin/env python
-
-import shutil
-import click
-import livereload
 import logging
+import shutil
 import tempfile
+from pathlib import Path
+from urllib.parse import urlparse
 
+import click
+import livereload
 from livereload.handlers import LiveReloadHandler
-from pathlib import Path
 from rich.logging import RichHandler
-from urllib.parse import urlparse
 
 from .config import Config
 from .constants import (
-    EXPECTED_CONFIG_LOCATION,
     DEFAULT_OUTPUT_DIR,
-    VERSION,
-    REVEALJS_VERSION,
+    EXPECTED_CONFIG_LOCATION,
     HIGHLIGHTJS_THEMES_VERSION,
+    REVEALJS_VERSION,
+    VERSION,
 )
 from .markupgenerator import MarkupGenerator
 
-
 logger = logging.getLogger()
 logger.setLevel("DEBUG")
 logger.addHandler(RichHandler(show_path=False))
@@ -54,8 +51,7 @@
     "",
 )
 def cli() -> None:
-    "MkSlides-Reveal - Slides with Markdown using the power of Reveal.js."
-    pass
+    """MkSlides-Reveal - Slides with Markdown using the power of Reveal.js."""
 
 
 def read_config(config_location: str) -> Config:
@@ -100,12 +96,10 @@ def generate(config_file, input_path: Path, output_directory: Path) -> None:
     default=DEFAULT_OUTPUT_DIR,
 )
 def build(files, config_file, site_dir) -> None:
-    """
-    Build the MkDocs documentation.
+    """Build the MkDocs documentation.
 
     FILENAME|PATH is the path to the Markdown file, or the directory containing Markdown files.
     """
-
     logger.info("Command: build")
 
     input_path = Path(files).resolve(strict=True)
@@ -161,12 +155,10 @@ def serve(
     watch_slides_template,
     config_file,
 ) -> None:
-    """
-    Run the builtin development server.
+    """Run the builtin development server.
 
     FILENAME|PATH is the path to the Markdown file, or the directory containing Markdown files.
     """
-
     logger.info("Command: serve")
 
     input_path = Path(files).resolve(strict=True)
@@ -190,7 +182,7 @@ def reload() -> None:
 
         watched_paths = [
             files,
-            config_file,  # TODO reload config
+            config_file,  # TODO: reload config
         ]
 
         if watch_index_theme:
diff --git a/src/mkslides_reveal/config.py b/src/mkslides_reveal/config.py
index 37bdc13..bc1997c 100644
--- a/src/mkslides_reveal/config.py
+++ b/src/mkslides_reveal/config.py
@@ -1,11 +1,9 @@
-import importlib
 import logging
-import yaml
-
 from pathlib import Path
 
-from .constants import DEFAULT_CONFIG_RESOURCE
+import yaml
 
+from .constants import DEFAULT_CONFIG_RESOURCE
 
 logger = logging.getLogger(__name__)
 
@@ -72,7 +70,7 @@ def merge_config_from_file(self, config_path: Path) -> None:
     def merge_config_from_dict(self, new_config: dict) -> None:
         self.__config = self.__recursive_merge(self.__config, new_config)
 
-        logger.info(f"Config merged from dict")
+        logger.info("Config merged from dict")
         logger.info(f"Config: {self.__config}")
 
     def __get(self, *keys) -> str | dict | list | None:
diff --git a/src/mkslides_reveal/constants.py b/src/mkslides_reveal/constants.py
index a4808de..ad61381 100644
--- a/src/mkslides_reveal/constants.py
+++ b/src/mkslides_reveal/constants.py
@@ -1,7 +1,7 @@
 import json
 import re
+from importlib import metadata, resources
 
-from importlib import resources, metadata
 from jinja2 import Environment, FileSystemLoader, PackageLoader, select_autoescape
 
 MD_LINK_REGEX = re.compile(
@@ -51,11 +51,12 @@
 HIGHLIGHTJS_THEMES_RESOURCE = HIGHLIGHTJS_RESOURCE.joinpath("build", "styles")
 
 DEFAULT_JINJA2_ENVIRONMENT = Environment(
-    loader=PackageLoader("assets"), autoescape=select_autoescape()
+    loader=PackageLoader("assets"),
+    autoescape=select_autoescape(),
 )
 DEFAULT_INDEX_TEMPLATE = DEFAULT_JINJA2_ENVIRONMENT.get_template("index.html.jinja")
 DEFAULT_SLIDESHOW_TEMPLATE = DEFAULT_JINJA2_ENVIRONMENT.get_template(
-    "slideshow.html.jinja"
+    "slideshow.html.jinja",
 )
 LOCAL_JINJA2_ENVIRONMENT = Environment(loader=FileSystemLoader("."))
 
diff --git a/src/mkslides_reveal/markupgenerator.py b/src/mkslides_reveal/markupgenerator.py
index b6220e9..f5f9c55 100644
--- a/src/mkslides_reveal/markupgenerator.py
+++ b/src/mkslides_reveal/markupgenerator.py
@@ -1,26 +1,26 @@
 import datetime
-import frontmatter
 import logging
 import shutil
 import time
-
 from importlib import resources
 from importlib.resources.abc import Traversable
 from pathlib import Path
 from typing import Any
 from urllib.parse import urlparse
 
+import frontmatter
+
 from .config import Config
 from .constants import (
+    DEFAULT_INDEX_TEMPLATE,
+    DEFAULT_SLIDESHOW_TEMPLATE,
+    HIGHLIGHTJS_THEMES_RESOURCE,
     HTML_BACKGROUND_IMAGE_REGEX,
     HTML_IMAGE_REGEX,
+    LOCAL_JINJA2_ENVIRONMENT,
     MD_LINK_REGEX,
     REVEALJS_RESOURCE,
     REVEALJS_THEMES_RESOURCE,
-    HIGHLIGHTJS_THEMES_RESOURCE,
-    DEFAULT_INDEX_TEMPLATE,
-    DEFAULT_SLIDESHOW_TEMPLATE,
-    LOCAL_JINJA2_ENVIRONMENT,
 )
 
 logger = logging.getLogger(__name__)
@@ -31,8 +31,7 @@ def __init__(
         self,
         config: Config,
         output_directory_path: Path,
-    ):
-
+    ) -> None:
         # Config
 
         self.config = config
@@ -41,7 +40,7 @@ def __init__(
 
         self.output_directory_path = output_directory_path.resolve(strict=False)
         logger.info(
-            f'Requested output directory: "{self.output_directory_path.absolute()}"'
+            f'Requested output directory: "{self.output_directory_path.absolute()}"',
         )
 
         self.output_assets_path = self.output_directory_path / "assets"
@@ -60,32 +59,33 @@ def create_output_directory(self) -> None:
             self.clear_output_directory()
         else:
             self.output_directory_path.mkdir(parents=True, exist_ok=True)
-            logger.info(f"Output directory created")
+            logger.info("Output directory created")
 
-        with resources.as_file(REVEALJS_RESOURCE) as REVEALJS_PATH:
-            self.__copy(REVEALJS_PATH, self.output_revealjs_path)
+        with resources.as_file(REVEALJS_RESOURCE) as revealjs_path:
+            self.__copy(revealjs_path, self.output_revealjs_path)
 
     def process_markdown(self, input_path: Path) -> None:
-        logger.info(f"Processing markdown")
+        logger.info("Processing markdown")
         start_time = time.perf_counter()
 
         if input_path.is_dir():
             self.__process_markdown_directory(input_path)
         else:
             _, output_markup_path = self.__process_markdown_file(
-                input_path, input_path.parent
+                input_path,
+                input_path.parent,
             )
             original_output_markup_path = output_markup_path
 
             if output_markup_path.stem != "index":
                 output_markup_path.rename(output_markup_path.with_stem("index"))
                 logger.info(
-                    f'Renamed "{original_output_markup_path.absolute()}" to "{output_markup_path.absolute()}" as it was the only Markdown file'
+                    f'Renamed "{original_output_markup_path.absolute()}" to "{output_markup_path.absolute()}" as it was the only Markdown file',
                 )
 
         end_time = time.perf_counter()
         logger.info(
-            f"Finished processing markdown in {end_time - start_time:.2f} seconds"
+            f"Finished processing markdown in {end_time - start_time:.2f} seconds",
         )
 
     ################################################################################
@@ -108,12 +108,13 @@ def __process_markdown_file(
         # Get the relative path of reveal.js
 
         output_markup_path = self.output_directory_path / md_file.relative_to(
-            md_root_path
+            md_root_path,
         )
 
         output_markup_path = output_markup_path.with_suffix(".html")
         relative_revealjs_path = self.output_revealjs_path.relative_to(
-            output_markup_path.parent, walk_up=True
+            output_markup_path.parent,
+            walk_up=True,
         )
 
         revealjs_config = self.config.get_revealjs_options()
@@ -123,7 +124,9 @@ def __process_markdown_file(
         relative_theme_path = None
         if theme := self.config.get_slides_theme():
             relative_theme_path = self.__copy_theme(
-                output_markup_path, theme, REVEALJS_THEMES_RESOURCE
+                output_markup_path,
+                theme,
+                REVEALJS_THEMES_RESOURCE,
             )
 
         # Copy the highlight CSS
@@ -131,7 +134,9 @@ def __process_markdown_file(
         relative_highlight_theme_path = None
         if theme := self.config.get_slides_highlight_theme():
             relative_highlight_theme_path = self.__copy_theme(
-                output_markup_path, theme, HIGHLIGHTJS_THEMES_RESOURCE
+                output_markup_path,
+                theme,
+                HIGHLIGHTJS_THEMES_RESOURCE,
             )
 
         # Copy the favicon
@@ -188,19 +193,20 @@ def __process_markdown_directory(self, md_root_path: Path) -> None:
         slideshows = []
         for md_file in md_root_path.glob("**/*.md"):
             (metadata, output_markup_path) = self.__process_markdown_file(
-                md_file, md_root_path
+                md_file,
+                md_root_path,
             )
 
             slideshows.append(
                 {
                     "title": metadata.get("title", md_file.stem),
                     "location": output_markup_path.relative_to(
-                        self.output_directory_path
+                        self.output_directory_path,
                     ),
-                }
+                },
             )
 
-        logger.info(f"Generating index")
+        logger.info("Generating index")
 
         index_path = self.output_directory_path / "index.html"
 
@@ -233,7 +239,10 @@ def __process_markdown_directory(self, md_root_path: Path) -> None:
         self.__create_file(index_path, content)
 
     def __copy_local_files(
-        self, md_file: Path, md_root_path: Path, markdown: str
+        self,
+        md_file: Path,
+        md_root_path: Path,
+        markdown: str,
     ) -> None:
         for regex in [MD_LINK_REGEX, HTML_IMAGE_REGEX, HTML_BACKGROUND_IMAGE_REGEX]:
             for m in regex.finditer(markdown):
@@ -251,7 +260,7 @@ def __copy_theme(
     ) -> Path | str:
         if self.__is_absolute_url(theme):
             logger.info(
-                f'Using theme "{theme}" from an absolute URL, no copy necessary'
+                f'Using theme "{theme}" from an absolute URL, no copy necessary',
             )
             return theme
 
@@ -259,11 +268,11 @@ def __copy_theme(
         if not theme.endswith(".css"):
             assert default_theme_resource is not None
             with resources.as_file(
-                default_theme_resource.joinpath(theme)
+                default_theme_resource.joinpath(theme),
             ) as theme_path:
                 theme_path = theme_path.with_suffix(".css").resolve(strict=True)
                 logger.info(
-                    f'Using built-in theme "{theme}" from "{theme_path.absolute()}"'
+                    f'Using built-in theme "{theme}" from "{theme_path.absolute()}"',
                 )
         else:
             theme_path = Path(theme).resolve(strict=True)
@@ -273,7 +282,8 @@ def __copy_theme(
         self.__copy_to_output(theme_path, theme_output_path)
 
         relative_theme_path = theme_output_path.relative_to(
-            file_using_theme_path.parent, walk_up=True
+            file_using_theme_path.parent,
+            walk_up=True,
         )
 
         return relative_theme_path
@@ -281,7 +291,7 @@ def __copy_theme(
     def __copy_favicon(self, file_using_favicon_path: Path, favicon: str) -> Path | str:
         if self.__is_absolute_url(favicon):
             logger.info(
-                f'Using favicon "{favicon}" from an absolute URL, no copy necessary'
+                f'Using favicon "{favicon}" from an absolute URL, no copy necessary',
             )
             return favicon
 
@@ -292,7 +302,8 @@ def __copy_favicon(self, file_using_favicon_path: Path, favicon: str) -> Path |
         self.__copy_to_output(favicon_path, favicon_output_path)
 
         relative_favicon_path = favicon_output_path.relative_to(
-            file_using_favicon_path.parent, walk_up=True
+            file_using_favicon_path.parent,
+            walk_up=True,
         )
 
         return relative_favicon_path
@@ -314,12 +325,14 @@ def __copy_to_output(self, source_path: Path, destination_path: Path) -> Path:
         return relative_path
 
     def __copy_to_output_relative_to_md_root(
-        self, source_path: Path, md_root_path: Path
+        self,
+        source_path: Path,
+        md_root_path: Path,
     ) -> Path | None:
         source_path = source_path.resolve(strict=True)
         if not source_path.is_relative_to(md_root_path):
             logger.warning(
-                f'"{source_path.absolute()}" is outside the markdown root directory, skipped!"'
+                f'"{source_path.absolute()}" is outside the markdown root directory, skipped!"',
             )
             return None
 
@@ -343,7 +356,7 @@ def __copy_tree(self, source_path, destination_path) -> None:
 
         action = "Overwritten" if overwrite else "Copied"
         logger.info(
-            f'{action} directory "{source_path.absolute()}" to "{destination_path.absolute()}"'
+            f'{action} directory "{source_path.absolute()}" to "{destination_path.absolute()}"',
         )
 
     def __copy_file(self, source_path, destination_path) -> None:
@@ -353,7 +366,7 @@ def __copy_file(self, source_path, destination_path) -> None:
 
         action = "Overwritten" if overwrite else "Copied"
         logger.info(
-            f'{action} file "{source_path.absolute()}" to "{destination_path.absolute()}"'
+            f'{action} file "{source_path.absolute()}" to "{destination_path.absolute()}"',
         )
 
     def __is_absolute_url(self, url: str) -> bool:
diff --git a/tests/conftest.py b/tests/conftest.py
index b980f86..d0a943d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,7 +1,7 @@
-import pytest
-
 from pathlib import Path
 
+import pytest
+
 from mkslides_reveal.config import Config
 from mkslides_reveal.markupgenerator import MarkupGenerator
 
diff --git a/tests/test_base.py b/tests/test_base.py
index 8096543..278cbbe 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -1,9 +1,10 @@
 from pathlib import Path
+from typing import Any
 
 from tests.utils import assert_files_exist, assert_html_contains
 
 
-def test_process_directory_without_config(setup_markup_generator) -> None:
+def test_process_directory_without_config(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     test_files_path = Path("tests/test_files")
     markup_generator.process_markdown(test_files_path)
@@ -51,7 +52,7 @@ def test_process_directory_without_config(setup_markup_generator) -> None:
     )
 
 
-def test_process_file_without_config(setup_markup_generator) -> None:
+def test_process_file_without_config(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     test_file_path = Path("tests/test_files/someslides.md")
     markup_generator.process_markdown(test_file_path)
@@ -75,4 +76,6 @@ def test_process_file_without_config(setup_markup_generator) -> None:
         ],
     )
 
-    assert not (output_path / "someslides.html").exists(), "someslides.html should not exist"
+    assert not (
+        output_path / "someslides.html"
+    ).exists(), "someslides.html should not exist"
diff --git a/tests/test_index.py b/tests/test_index.py
index 8492015..42b795e 100644
--- a/tests/test_index.py
+++ b/tests/test_index.py
@@ -1,16 +1,17 @@
 from pathlib import Path
+from typing import Any
 
 from tests.utils import assert_html_contains
 
 
-def test_index_title(setup_markup_generator) -> None:
+def test_index_title(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "index": {
                 "title": "Lorem ipsum",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -19,7 +20,7 @@ def test_index_title(setup_markup_generator) -> None:
     assert_html_contains(
         output_path / "index.html",
         [
-            '<title>Lorem ipsum</title>',
-            '<h1>Lorem ipsum</h1>',
+            "<title>Lorem ipsum</title>",
+            "<h1>Lorem ipsum</h1>",
         ],
     )
diff --git a/tests/test_markdown_data_options.py b/tests/test_markdown_data_options.py
index 43a3082..aa6de01 100644
--- a/tests/test_markdown_data_options.py
+++ b/tests/test_markdown_data_options.py
@@ -1,11 +1,11 @@
 import re
-
 from pathlib import Path
+from typing import Any
 
 from tests.utils import assert_html_contains_regexp
 
 
-def test_revealjs_markdown_data_options(setup_markup_generator) -> None:
+def test_revealjs_markdown_data_options(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
@@ -14,8 +14,8 @@ def test_revealjs_markdown_data_options(setup_markup_generator) -> None:
                 "separator": r"^\s*---\s*$",
                 "separator_vertical": r"^\s*-v-\s*$",
                 "separator_notes": r"^Notes?:",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
diff --git a/tests/test_plugins.py b/tests/test_plugins.py
index 0e205cb..0991ec4 100644
--- a/tests/test_plugins.py
+++ b/tests/test_plugins.py
@@ -1,10 +1,11 @@
-from pathlib import Path
 import re
+from pathlib import Path
+from typing import Any
 
 from tests.utils import assert_html_contains, assert_html_contains_regexp
 
 
-def test_plugins(setup_markup_generator) -> None:
+def test_plugins(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
@@ -12,16 +13,16 @@ def test_plugins(setup_markup_generator) -> None:
                 {
                     "name": "RevealMermaid",
                     "extra_javascript": [
-                        "https://cdn.jsdelivr.net/npm/reveal.js-mermaid-plugin/plugin/mermaid/mermaid.min.js"
+                        "https://cdn.jsdelivr.net/npm/reveal.js-mermaid-plugin/plugin/mermaid/mermaid.min.js",
                     ],
                 },
                 {
                     "extra_javascript": [
-                        "https://cdn.jsdelivr.net/npm/reveal-plantuml/dist/reveal-plantuml.min.js"
-                    ]
+                        "https://cdn.jsdelivr.net/npm/reveal-plantuml/dist/reveal-plantuml.min.js",
+                    ],
                 },
-            ]
-        }
+            ],
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -35,10 +36,6 @@ def test_plugins(setup_markup_generator) -> None:
         ],
     )
 
-    with open(output_path / "someslides.html", "r") as file:
-        contents = file.read()
-        print(contents)
-
     assert_html_contains_regexp(
         output_path / "someslides.html",
         re.compile(
diff --git a/tests/test_revealjs_options.py b/tests/test_revealjs_options.py
index 0aa4c9b..6ed2e7a 100644
--- a/tests/test_revealjs_options.py
+++ b/tests/test_revealjs_options.py
@@ -1,10 +1,12 @@
-from pathlib import Path
 import re
+from pathlib import Path
+from typing import Any
 
 from tests.utils import assert_html_contains, assert_html_contains_regexp
 
+
 # Necessary for livereload to work properly
-def test_revealjs_default_options(setup_markup_generator) -> None:
+def test_revealjs_default_options(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
 
     test_files_path = Path("tests/test_files")
@@ -18,15 +20,15 @@ def test_revealjs_default_options(setup_markup_generator) -> None:
     )
 
 
-def test_revealjs_integer_options(setup_markup_generator) -> None:
+def test_revealjs_integer_options(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "reveal.js": {
                 "height": 1080,
                 "width": 1920,
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -48,23 +50,20 @@ def test_revealjs_integer_options(setup_markup_generator) -> None:
         ),
     )
 
-def test_revealjs_string_options(setup_markup_generator) -> None:
+
+def test_revealjs_string_options(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "reveal.js": {
                 "transition": "fade",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
     markup_generator.process_markdown(test_files_path)
 
-    with open(output_path / "someslides.html", "r") as file:
-        contents = file.read()
-        print(contents)
-
     assert_html_contains_regexp(
         output_path / "someslides.html",
         re.compile(
diff --git a/tests/test_themes.py b/tests/test_themes.py
index c332617..07ab2e0 100644
--- a/tests/test_themes.py
+++ b/tests/test_themes.py
@@ -1,17 +1,18 @@
 from pathlib import Path
+from typing import Any
 
 from tests.utils import assert_files_exist, assert_html_contains
 
 
-def test_local_slideshow_theme_path(setup_markup_generator) -> None:
+def test_local_slideshow_theme_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "slides": {
                 "theme": "tests/test_styles/theme.css",
                 "highlight_theme": "tests/test_styles/highlight-theme.css",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -36,15 +37,15 @@ def test_local_slideshow_theme_path(setup_markup_generator) -> None:
     )
 
 
-def test_absolute_url_slideshow_theme_path(setup_markup_generator) -> None:
+def test_absolute_url_slideshow_theme_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "slides": {
                 "theme": "https://example.org/theme.css",
                 "highlight_theme": "https://example.org/highlight-theme.css",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -69,15 +70,15 @@ def test_absolute_url_slideshow_theme_path(setup_markup_generator) -> None:
     )
 
 
-def test_builtin_slideshow_theme_path(setup_markup_generator) -> None:
+def test_builtin_slideshow_theme_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "slides": {
                 "theme": "simple",
                 "highlight_theme": "vs",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -109,14 +110,14 @@ def test_builtin_slideshow_theme_path(setup_markup_generator) -> None:
     )
 
 
-def test_local_index_theme_path(setup_markup_generator) -> None:
+def test_local_index_theme_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "index": {
                 "theme": "tests/test_styles/theme.css",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -130,14 +131,14 @@ def test_local_index_theme_path(setup_markup_generator) -> None:
     )
 
 
-def test_absolute_url_index_theme_path(setup_markup_generator) -> None:
+def test_absolute_url_index_theme_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "index": {
                 "theme": "https://example.org/theme.css",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -150,14 +151,15 @@ def test_absolute_url_index_theme_path(setup_markup_generator) -> None:
         ],
     )
 
-def test_absolute_url_index_favicon_path(setup_markup_generator) -> None:
+
+def test_absolute_url_index_favicon_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "index": {
                 "favicon": "https://hogenttin.github.io/cdn/favicon/favicon.ico",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -170,14 +172,15 @@ def test_absolute_url_index_favicon_path(setup_markup_generator) -> None:
         ],
     )
 
-def test_absolute_url_slideshow_favicon_path(setup_markup_generator) -> None:
+
+def test_absolute_url_slideshow_favicon_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "slides": {
                 "favicon": "https://hogenttin.github.io/cdn/favicon/favicon.ico",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -197,14 +200,15 @@ def test_absolute_url_slideshow_favicon_path(setup_markup_generator) -> None:
         ],
     )
 
-def test_local_index_favicon_path(setup_markup_generator) -> None:
+
+def test_local_index_favicon_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "index": {
                 "favicon": "tests/test_styles/favicon.ico",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
@@ -217,14 +221,15 @@ def test_local_index_favicon_path(setup_markup_generator) -> None:
         ],
     )
 
-def test_local_slideshow_favicon_path(setup_markup_generator) -> None:
+
+def test_local_slideshow_favicon_path(setup_markup_generator: Any) -> None:
     markup_generator, output_path = setup_markup_generator
     markup_generator.config.merge_config_from_dict(
         {
             "slides": {
                 "favicon": "tests/test_styles/favicon.ico",
-            }
-        }
+            },
+        },
     )
 
     test_files_path = Path("tests/test_files")
diff --git a/tests/utils.py b/tests/utils.py
index e26ba7e..461ab2c 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -1,6 +1,5 @@
-import re
-
 from pathlib import Path
+from re import Pattern
 
 
 def assert_files_exist(output_path: Path, files: list[str]) -> None:
@@ -14,7 +13,8 @@ def assert_html_contains(file_path: Path, expected_content: list[str]) -> None:
         for substring in expected_content:
             assert substring in content, f"{substring} not found in {file_path}"
 
-def assert_html_contains_regexp(file_path: Path, regexp: re.Pattern) -> None:
+
+def assert_html_contains_regexp(file_path: Path, regexp: Pattern[str]) -> None:
     with file_path.open() as file:
         content = file.read()
         assert regexp.search(content), f"{regexp} not found in {file_path}"