diff --git a/Core/Core/Extensions/UIApplicationExtension.swift b/Core/Core/Extensions/UIApplicationExtension.swift
index 59160ad6a..022c1770a 100644
--- a/Core/Core/Extensions/UIApplicationExtension.swift
+++ b/Core/Core/Extensions/UIApplicationExtension.swift
@@ -45,10 +45,10 @@ extension UINavigationController {
         navigationBar.shadowImage = UIImage()
         
         let image = CoreAssets.arrowLeft.image
-        navigationBar.backIndicatorImage = image.withTintColor(Theme.Colors.accentColor.uiColor())
+        navigationBar.backIndicatorImage = image.withTintColor(Theme.UIColors.accentColor)
         navigationBar.backItem?.backButtonTitle = " "
-        navigationBar.backIndicatorTransitionMaskImage = image.withTintColor(Theme.Colors.accentColor.uiColor())
-        navigationBar.titleTextAttributes = [.foregroundColor: Theme.Colors.textPrimary.uiColor()]
+        navigationBar.backIndicatorTransitionMaskImage = image.withTintColor(Theme.UIColors.accentColor)
+        navigationBar.titleTextAttributes = [.foregroundColor: Theme.UIColors.textPrimary]
     }
 }
 
diff --git a/Core/Core/Extensions/ViewExtension.swift b/Core/Core/Extensions/ViewExtension.swift
index 23b37eed9..beb650ebe 100644
--- a/Core/Core/Extensions/ViewExtension.swift
+++ b/Core/Core/Extensions/ViewExtension.swift
@@ -6,7 +6,7 @@
 //
 
 import Foundation
-import SwiftUIIntrospect
+@_spi(Advanced) import SwiftUIIntrospect
 import SwiftUI
 import Theme
 
@@ -193,13 +193,22 @@ public extension View {
         } else {
             return self.introspect(
                 .navigationView(style: .stack),
-                on: .iOS(.v14, .v15, .v16, .v17),
+                on: .iOS(.v15...),
                 scope: .ancestor) {
                     $0.isNavigationBarHidden = true
                 }
         }
     }
     
+    func navigationBackground(color: UIColor) -> some View {
+        return self.introspect(
+            .navigationView(style: .stack),
+            on: .iOS(.v15...),
+            scope: .ancestor) {
+                $0.navigationBar.barTintColor = color
+            }
+    }
+
     func hideScrollContentBackground() -> some View {
         if #available(iOS 16.0, *) {
             return self.scrollContentBackground(.hidden)
diff --git a/Core/Core/View/Base/ScrollSlidingTabBar/ScrollSlidingTabBar.swift b/Core/Core/View/Base/ScrollSlidingTabBar/ScrollSlidingTabBar.swift
index 650335a0e..994975cfa 100644
--- a/Core/Core/View/Base/ScrollSlidingTabBar/ScrollSlidingTabBar.swift
+++ b/Core/Core/View/Base/ScrollSlidingTabBar/ScrollSlidingTabBar.swift
@@ -163,8 +163,8 @@ extension ScrollSlidingTabBar {
         public static let `default` = Style(
             font: .body,
             selectedFont: .body.bold(),
-            activeAccentColor: Theme.Colors.accentColor ,
-            inactiveAccentColor: .black.opacity(0.4),
+            activeAccentColor: Theme.Colors.accentColor,
+            inactiveAccentColor: Theme.Colors.textSecondary,
             indicatorHeight: 2,
             borderColor: .gray.opacity(0.2),
             borderHeight: 1,
diff --git a/Core/Core/View/Base/WebUnitView.swift b/Core/Core/View/Base/WebUnitView.swift
index f85f0914f..8d3123861 100644
--- a/Core/Core/View/Base/WebUnitView.swift
+++ b/Core/Core/View/Base/WebUnitView.swift
@@ -6,7 +6,7 @@
 //
 
 import SwiftUI
-import SwiftUIIntrospect
+@_spi(Advanced) import SwiftUIIntrospect
 import Theme
 
 public struct WebUnitView: View {
@@ -62,7 +62,7 @@ public struct WebUnitView: View {
                             .frame(width: reader.size.width, height: reader.size.height)
                         }
                     }
-                    .introspect(.scrollView, on: .iOS(.v14, .v15, .v16, .v17), customize: { scrollView in
+                    .introspect(.scrollView, on: .iOS(.v15...), customize: { scrollView in
                         scrollView.isScrollEnabled = false
                     })
                     if viewModel.updatingCookies || isWebViewLoading {
diff --git a/Course/Course/Presentation/Container/CourseContainerView.swift b/Course/Course/Presentation/Container/CourseContainerView.swift
index 6b8606a94..3903d4556 100644
--- a/Course/Course/Presentation/Container/CourseContainerView.swift
+++ b/Course/Course/Presentation/Container/CourseContainerView.swift
@@ -84,6 +84,8 @@ public struct CourseContainerView: View {
         .navigationBarBackButtonHidden(false)
         .navigationTitle(titleBar())
         .onChange(of: selection, perform: didSelect)
+        .navigationBackground(color: Theme.UIColors.background)
+        .background(Theme.Colors.background)
     }
 
     @ViewBuilder
diff --git a/Theme/Theme/Theme.swift b/Theme/Theme/Theme.swift
index 8e9ec9aab..bbb98140e 100644
--- a/Theme/Theme/Theme.swift
+++ b/Theme/Theme/Theme.swift
@@ -91,6 +91,22 @@ public struct Theme {
         }
     }
     
+    public struct UIColors {
+        public private(set) static var textPrimary = ThemeAssets.textPrimary.color
+        public private(set) static var accentColor = ThemeAssets.accentColor.color
+        public private(set) static var background = ThemeAssets.background.color
+
+        public static func update(
+            textPrimary: UIColor = ThemeAssets.textPrimary.color,
+            accentColor: UIColor = ThemeAssets.accentColor.color,
+            background: UIColor = ThemeAssets.background.color
+        ) {
+            self.textPrimary = textPrimary
+            self.accentColor = accentColor
+            self.background = background
+        }
+    }
+
     public struct Fonts {
         
         public static let displayLarge: Font = .custom(fontsParser.fontName(for: .regular), size: 57)