style.css

@font-face {
    font-family: 'open_sansregular';
    src: url('fonts/OpenSans-Regular-webfont.eot');
    src: url('fonts/OpenSans-Regular-webfont.eot?#iefix') format('embedded-opentype'), url('fonts/OpenSans-Regular-webfont.woff') format('woff'), url('fonts/OpenSans-Regular-webfont.ttf') format('truetype'), url('fonts/OpenSans-Regular-webfont.svg#open_sansregular') format('svg');
    font-weight: normal;
    font-style: normal;
}
@font-face {
    font-family: 'open_sanslight';
    src: url('fonts/OpenSans-Light-webfont.eot');
    src: url('fonts/OpenSans-Light-webfont.eot?#iefix') format('embedded-opentype'), url('fonts/OpenSans-Light-webfont.woff') format('woff'), url('fonts/OpenSans-Light-webfont.ttf') format('truetype'), url('fonts/OpenSans-Light-webfont.svg#open_sanslight') format('svg');
    font-weight: normal;
    font-style: normal;
}
html,
body {
    margin: 0;
    padding: 0;
    font-family: "open_sanslight", "Open Sans", "Helvetica", "Verdana", sans-serif;
    background-color: #f1f1f3;
    color: #ededed;
    height: 100%;
    line-height: 150%;
    font-size: 14px;
}
header {
    height: 50px;
}
code {
    background-color: #ededed;
    color: #454545;
    padding: 2px 4px;
}
code.returns {
    background-color: #4fc34a;
    color: #454545;
}
h1 {
    font-family: "open_sanslight", "Open Sans";
    letter-spacing: 2px;
    padding: 10px;
    margin: 0px;
}
h2 {
    letter-spacing: 2px;
    padding: 0 10px;
}
p {
    padding: 20px;
    line-height: 150%;
}
.dark {
    background-color: #272727;
    padding: 20px 0;
}
.question {
    float: left;
    background-color: #454545;
    color: #ededed;
    width: 30%;
    height: 100%;
    overflow-x: hidden;
}
.homepage {
    background-color: #f1f1f3;
    color: #ededed;
    width: 100%;
    height: 100%;
    overflow-x: hidden;
}
.centralmenu {
    margin: 40px auto;
    width: 30%;
    background: #fff;
    padding: 0px;
    box-shadow: 0 2px 3px rgba(0, 0, 0, .26);
}
.centralmenu a {
    display: block;
    padding: 20px 30px;
    border-bottom: 1px solid #eee;
    color: #8bc34a;
    text-decoration: none;
}
.centralmenu a:hover {
    color: #689f38;
    padding: 20px 35px;
}
.toolbar {
    height: 120px;
    background: #8bc34a;
    box-shadow: 0 4px 2px -2px rgba(0, 0, 0, .26);
}
.mainContent {
    color: #ededed;
    height: -moz-calc(100% - 40px);
    height: -webkit-calc(100% - 40px);
    height: calc(100% - 40px);
    margin-top: -80px;
    overflow-y: hidden;
}
.toolbar h1 {
    padding: 0.7em 40px;
    font-size: 2.5em;
}
.toolbar .backtohome {
    color: white;
    padding-left: 40px;
    color: #ededed;
    text-decoration: none;
}
.backtohome:hover {
    color: white;
}
.large {
    font-size: 1.5em;
    margin: 0em;
    padding-top: 0em;
}
.editor {
    float: left;
    width: 50%;
}
.taskspace {
    position: relative;
    padding: 20px;
}
.taskarea {
    position: relative;
    background-color: #8bc34a;
    margin: 20px 0px 20px 20px;
    padding: 20px 0px 20px 15px;
}
.taskarea:after {
    left: 100%;
    top: 50%;
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
    border-color: rgba(139, 195, 74, 0);
    border-left-color: #8bc34a;
    border-width: 20px;
    margin-top: -20px;
}
.taskarea a {
    color: white;
}
.taskarea a:hover {
    color: white;
}
.feedback {
    float: left;
    background-color: #454545;
    color: #ededed;
    width: 20%;
    height: 100%;
}
.correct {
    background-color: #4fc34a;
}
.explanation {
    margin: 20px;
}
#description {
    margin: 20px;
}
#description p {
    padding-bottom: 0;
}
.result {
    float: left;
    margin: 10px 10%;
    width: 80%;
    min-height: 150px;
}
.wrong {
    background-color: #e51c23;
}
.button {
    margin: 10px 10%;
    width: 80%;
    float: left;
    font-size: 1.25em;
    color: #666;
    border-radius: 2px;
    background: #f7f7f7;
    border: none;
    box-shadow: 0 1px 3px #666;
}
button {
    font-size: 1.25em;
    min-width: 100px;
    min-height: 40px;
}
button:disabled {
    color: #ccc;
}
/* BASICS */

.CodeMirror {
    /* Set height, width, borders, and global font properties here */
    position: relative;
    font-family: monospace;
    height: 100%;
    min-width: 320px;
}
.CodeMirror-scroll {
    /* Set scrolling behaviour here */
    overflow: auto;
}
/* PADDING */

.CodeMirror-lines {
    padding: 4px 0;
    /* Vertical padding around content */
}
.CodeMirror pre {
    padding: 0 4px;
    /* Horizontal padding of content */
}
.CodeMirror-scrollbar-filler,
.CodeMirror-gutter-filler {
    background-color: white;
    /* The little square between H and V scrollbars */
}
/* GUTTER */

.CodeMirror-gutters {
    border-right: 1px solid #ddd;
    background-color: #f7f7f7;
    white-space: nowrap;
}
.CodeMirror-linenumbers {} .CodeMirror-linenumber {
    padding: 0 3px 0 5px;
    min-width: 20px;
    text-align: right;
    color: #999;
    -moz-box-sizing: content-box;
    box-sizing: content-box;
}
.CodeMirror-guttermarker {
    color: black;
}
.CodeMirror-guttermarker-subtle {
    color: #999;
}
/* CURSOR */

.CodeMirror div.CodeMirror-cursor {
    border-left: 1px solid black;
}
/* Shown when moving in bi-directional text */

.CodeMirror div.CodeMirror-secondarycursor {
    border-left: 1px solid silver;
}
.CodeMirror.cm-keymap-fat-cursor div.CodeMirror-cursor {
    width: auto;
    border: 0;
    background: #7e7;
}
.cm-animate-fat-cursor {
    width: auto;
    border: 0;
    -webkit-animation: blink 1.06s steps(1) infinite;
    -moz-animation: blink 1.06s steps(1) infinite;
    animation: blink 1.06s steps(1) infinite;
}
@-moz-keyframes blink {
    0% {
        background: #7e7;
    }
    50% {
        background: none;
    }
    100% {
        background: #7e7;
    }
}
@-webkit-keyframes blink {
    0% {
        background: #7e7;
    }
    50% {
        background: none;
    }
    100% {
        background: #7e7;
    }
}
@keyframes blink {
    0% {
        background: #7e7;
    }
    50% {
        background: none;
    }
    100% {
        background: #7e7;
    }
}
/* Can style cursor different in overwrite (non-insert) mode */

div.CodeMirror-overwrite div.CodeMirror-cursor {} .cm-tab {
    display: inline-block;
}
.CodeMirror-ruler {
    border-left: 1px solid #ccc;
    position: absolute;
}
/* DEFAULT THEME */

.cm-s-default .cm-keyword {
    color: #708;
}
.cm-s-default .cm-atom {
    color: #219;
}
.cm-s-default .cm-number {
    color: #164;
}
.cm-s-default .cm-def {
    color: #00f;
}
.cm-s-default .cm-variable,
.cm-s-default .cm-punctuation,
.cm-s-default .cm-property,
.cm-s-default .cm-operator {} .cm-s-default .cm-variable-2 {
    color: #05a;
}
.cm-s-default .cm-variable-3 {
    color: #085;
}
.cm-s-default .cm-comment {
    color: #a50;
}
.cm-s-default .cm-string {
    color: #a11;
}
.cm-s-default .cm-string-2 {
    color: #f50;
}
.cm-s-default .cm-meta {
    color: #555;
}
.cm-s-default .cm-qualifier {
    color: #555;
}
.cm-s-default .cm-builtin {
    color: #30a;
}
.cm-s-default .cm-bracket {
    color: #997;
}
.cm-s-default .cm-tag {
    color: #170;
}
.cm-s-default .cm-attribute {
    color: #00c;
}
.cm-s-default .cm-header {
    color: blue;
}
.cm-s-default .cm-quote {
    color: #090;
}
.cm-s-default .cm-hr {
    color: #999;
}
.cm-s-default .cm-link {
    color: #00c;
}
.cm-negative {
    color: #d44;
}
.cm-positive {
    color: #292;
}
.cm-header,
.cm-strong {
    font-weight: bold;
}
.cm-em {
    font-style: italic;
}
.cm-link {
    text-decoration: underline;
}
.cm-s-default .cm-error {
    color: #f00;
}
.cm-invalidchar {
    color: #f00;
}
/* Default styles for common addons */

div.CodeMirror span.CodeMirror-matchingbracket {
    color: #0f0;
}
div.CodeMirror span.CodeMirror-nonmatchingbracket {
    color: #f22;
}
.CodeMirror-matchingtag {
    background: rgba(255, 150, 0, .3);
}
.CodeMirror-activeline-background {
    background: #e8f2ff;
}
/* STOP */

/* The rest of this file contains styles related to the mechanics of
   the editor. You probably shouldn't touch them. */

.CodeMirror {
    line-height: 1.75;
    position: relative;
    overflow: hidden;
    background: white;
    color: black;
}
.CodeMirror-scroll {
    /* 30px is the magic margin used to hide the element's real scrollbars */
    /* See overflow: hidden in .CodeMirror */
    margin-bottom: -30px;
    margin-right: -30px;
    padding-bottom: 30px;
    height: 100%;
    outline: none;
    /* Prevent dragging from highlighting the element */
    position: relative;
    -moz-box-sizing: content-box;
    box-sizing: content-box;
}
.CodeMirror-sizer {
    position: relative;
    border-right: 30px solid transparent;
    -moz-box-sizing: content-box;
    box-sizing: content-box;
}
/* The fake, visible scrollbars. Used to force redraw during scrolling
   before actuall scrolling happens, thus preventing shaking and
   flickering artifacts. */

.CodeMirror-vscrollbar,
.CodeMirror-hscrollbar,
.CodeMirror-scrollbar-filler,
.CodeMirror-gutter-filler {
    position: absolute;
    z-index: 6;
    display: none;
}
.CodeMirror-vscrollbar {
    right: 0;
    top: 0;
    overflow-x: hidden;
    overflow-y: scroll;
}
.CodeMirror-hscrollbar {
    bottom: 0;
    left: 0;
    overflow-y: hidden;
    overflow-x: scroll;
}
.CodeMirror-scrollbar-filler {
    right: 0;
    bottom: 0;
}
.CodeMirror-gutter-filler {
    left: 0;
    bottom: 0;
}
.CodeMirror-gutters {
    position: absolute;
    left: 0;
    top: 0;
    padding-bottom: 30px;
    z-index: 3;
}
.CodeMirror-gutter {
    white-space: normal;
    height: 100%;
    -moz-box-sizing: content-box;
    box-sizing: content-box;
    padding-bottom: 30px;
    margin-bottom: -32px;
    display: inline-block;
    /* Hack to make IE7 behave */
    *zoom: 1;
    *display: inline;
}
.CodeMirror-gutter-elt {
    position: absolute;
    cursor: default;
    z-index: 4;
}
.CodeMirror-lines {
    cursor: text;
}
.CodeMirror pre {
    /* Reset some styles that the rest of the page might have set */
    -moz-border-radius: 0;
    -webkit-border-radius: 0;
    border-radius: 0;
    border-width: 0;
    background: transparent;
    font-family: inherit;
    font-size: inherit;
    margin: 0;
    white-space: pre;
    word-wrap: normal;
    line-height: inherit;
    color: inherit;
    z-index: 2;
    position: relative;
    overflow: visible;
}
.CodeMirror-wrap pre {
    word-wrap: break-word;
    white-space: pre-wrap;
    word-break: normal;
}
.CodeMirror-linebackground {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 0;
}
.CodeMirror-linewidget {
    position: relative;
    z-index: 2;
    overflow: auto;
}
.CodeMirror-widget {} .CodeMirror-wrap .CodeMirror-scroll {
    overflow-x: hidden;
}
.CodeMirror-measure {
    position: absolute;
    width: 100%;
    height: 0;
    overflow: hidden;
    visibility: hidden;
}
.CodeMirror-measure pre {
    position: static;
}
.CodeMirror div.CodeMirror-cursor {
    position: absolute;
    border-right: none;
    width: 0;
}
div.CodeMirror-cursors {
    visibility: hidden;
    position: relative;
    z-index: 1;
}
.CodeMirror-focused div.CodeMirror-cursors {
    visibility: visible;
}
.CodeMirror-selected {
    background: #d9d9d9;
}
.CodeMirror-focused .CodeMirror-selected {
    background: #d7d4f0;
}
.CodeMirror-crosshair {
    cursor: crosshair;
}
.cm-searching {
    background: #ffa;
    background: rgba(255, 255, 0, .4);
}
/* IE7 hack to prevent it from returning funny offsetTops on the spans */

.CodeMirror span {
    *vertical-align: text-bottom;
}
/* Used to force a border model for a node */

.cm-force-border {
    padding-right: .1px;
}
@media print {
    /* Hide the cursor when printing */
    .CodeMirror div.CodeMirror-cursors {
        visibility: hidden;
    }
}