Add css code.

code/css.css

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+/* Some example CSS */
+
+@import url("something.css");
+
+body {
+  margin: 0;
+  padding: 3em 6em;
+  font-family: tahoma, arial, sans-serif;
+  color: #000;
+}
+
+#navigation a {
+  font-weight: bold;
+  text-decoration: none !important;
+}
+
+h1 {
+  font-size: 2.5em;
+}
+
+h2 {
+  font-size: 1.7em;
+}
+
+h1:before, h2:before {
+  content: "::";
+}
+
+code {
+  font-family: courier, monospace;
+  font-size: 80%;
+  color: #418A8A;
+}

code/less.less

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+@media screen and (device-aspect-ratio: 16/9) { }
+@media screen and (device-aspect-ratio: 1280/720) { }
+@media screen and (device-aspect-ratio: 2560/1440) { }
+
+html:lang(fr-be)
+
+tr:nth-child(2n+1) /* represents every odd row of an HTML table */
+
+img:nth-of-type(2n+1) { float: right; }
+img:nth-of-type(2n) { float: left; }
+
+body > h2:not(:first-of-type):not(:last-of-type)
+
+html|*:not(:link):not(:visited)
+*|*:not(:hover)
+p::first-line { text-transform: uppercase }
+
+@namespace foo url(http://www.example.com);
+foo|h1 { color: blue }  /* first rule */
+
+span[hello="Ocean"][goodbye="Land"]
+
+E[foo]{
+  padding:65px;
+}
+
+input[type="search"]::-webkit-search-decoration,
+input[type="search"]::-webkit-search-cancel-button {
+  -webkit-appearance: none; // Inner-padding issues in Chrome OSX, Safari 5
+}
+button::-moz-focus-inner,
+input::-moz-focus-inner { // Inner padding and border oddities in FF3/4
+  padding: 0;
+  border: 0;
+}
+.btn {
+  // reset here as of 2.0.3 due to Recess property order
+  border-color: #ccc;
+  border-color: rgba(0,0,0,.1) rgba(0,0,0,.1) rgba(0,0,0,.25);
+}
+fieldset span button, fieldset span input[type="file"] {
+  font-size:12px;
+	font-family:Arial, Helvetica, sans-serif;
+}
+
+.rounded-corners (@radius: 5px) {
+  border-radius: @radius;
+  -webkit-border-radius: @radius;
+  -moz-border-radius: @radius;
+}
+
+@import url("something.css");
+
+@light-blue:   hsl(190, 50%, 65%);
+
+#menu {
+  position: absolute;
+  width: 100%;
+  z-index: 3;
+  clear: both;
+  display: block;
+  background-color: @blue;
+  height: 42px;
+  border-top: 2px solid lighten(@alpha-blue, 20%);
+  border-bottom: 2px solid darken(@alpha-blue, 25%);
+  .box-shadow(0, 1px, 8px, 0.6);
+  -moz-box-shadow: 0 0 0 #000; // Because firefox sucks.
+
+  &.docked {
+    background-color: hsla(210, 60%, 40%, 0.4);
+  }
+  &:hover {
+    background-color: @blue;
+  }
+
+  #dropdown {
+    margin: 0 0 0 117px;
+    padding: 0;
+    padding-top: 5px;
+    display: none;
+    width: 190px;
+    border-top: 2px solid @medium;
+    color: @highlight;
+    border: 2px solid darken(@medium, 25%);
+    border-left-color: darken(@medium, 15%);
+    border-right-color: darken(@medium, 15%);
+    border-top-width: 0;
+    background-color: darken(@medium, 10%);
+    ul {
+      padding: 0px;  
+    }
+    li {
+      font-size: 14px;
+      display: block;
+      text-align: left;
+      padding: 0;
+      border: 0;
+      a {
+        display: block;
+        padding: 0px 15px;  
+        text-decoration: none;
+        color: white;  
+        &:hover {
+          background-color: darken(@medium, 15%);
+          text-decoration: none;
+        }
+      }
+    }
+    .border-radius(5px, bottom);
+    .box-shadow(0, 6px, 8px, 0.5);
+  }
+}

code/sass.sass

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+// Variable Definitions
+
+$page-width:    800px
+$sidebar-width: 200px
+$primary-color: #eeeeee
+
+// Global Attributes
+
+body
+  font:
+    family: sans-serif
+    size: 30em
+    weight: bold
+
+// Scoped Styles
+
+#contents
+  width: $page-width
+  #sidebar
+    float: right
+    width: $sidebar-width
+  #main
+    width: $page-width - $sidebar-width
+    background: $primary-color
+    h2
+      color: blue
+
+#footer
+  height: 200px

code/scss.scss

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+/* Some example SCSS */
+
+@import "compass/css3";
+$variable: #333;
+
+$blue: #3bbfce;
+$margin: 16px;
+
+.content-navigation {
+  #nested {
+    background-color: black;
+  }
+  border-color: $blue;
+  color:
+    darken($blue, 9%);
+}
+
+.border {
+  padding: $margin / 2;
+  margin: $margin / 2;
+  border-color: $blue;
+}
+
+@mixin table-base {
+  th {
+    text-align: center;
+    font-weight: bold;
+  }
+  td, th {padding: 2px}
+}
+
+table.hl {
+  margin: 2em 0;
+  td.ln {
+    text-align: right;
+  }
+}
+
+li {
+  font: {
+    family: serif;
+    weight: bold;
+    size: 1.2em;
+  }
+}
+
+@mixin left($dist) {
+  float: left;
+  margin-left: $dist;
+}
+
+#data {
+  @include left(10px);
+  @include table-base;
+}
+
+.source {
+  @include flow-into(target);
+  border: 10px solid green;
+  margin: 20px;
+  width: 200px; }
+
+.new-container {
+  @include flow-from(target);
+  border: 10px solid red;
+  margin: 20px;
+  width: 200px; }
+
+body {
+  margin: 0;
+  padding: 3em 6em;
+  font-family: tahoma, arial, sans-serif;
+  color: #000;
+}
+
+@mixin yellow() {
+  background: yellow;
+}
+
+.big {
+  font-size: 14px;
+}
+
+.nested {
+  @include border-radius(3px);
+  @extend .big;
+  p {
+    background: whitesmoke;
+    a {
+      color: red;
+    }
+  }
+}
+
+#navigation a {
+  font-weight: bold;
+  text-decoration: none !important;
+}
+
+h1 {
+  font-size: 2.5em;
+}
+
+h2 {
+  font-size: 1.7em;
+}
+
+h1:before, h2:before {
+  content: "::";
+}
+
+code {
+  font-family: courier, monospace;
+  font-size: 80%;
+  color: #418A8A;
+}

code/stylus.styl

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+/* Stylus mode */
+
+#id,
+.class,
+article
+  font-family Arial, sans-serif
+
+#id,
+.class,
+article {
+  font-family: Arial, sans-serif;
+}
+
+// Variables
+font-size-base = 16px
+line-height-base = 1.5
+font-family-base = "Helvetica Neue", Helvetica, Arial, sans-serif
+text-color = lighten(#000, 20%)
+
+body
+  font font-size-base/line-height-base font-family-base
+  color text-color
+
+body {
+  font: 400 16px/1.5 "Helvetica Neue", Helvetica, Arial, sans-serif;
+  color: #333;
+}
+
+// Variables
+link-color = darken(#428bca, 6.5%)
+link-hover-color = darken(link-color, 15%)
+link-decoration = none
+link-hover-decoration = false
+
+// Mixin
+tab-focus()
+  outline thin dotted
+  outline 5px auto -webkit-focus-ring-color
+  outline-offset -2px
+
+a
+  color link-color
+  if link-decoration
+    text-decoration link-decoration
+  &:hover
+  &:focus
+    color link-hover-color
+    if link-hover-decoration
+      text-decoration link-hover-decoration
+  &:focus
+    tab-focus()
+
+a {
+  color: #3782c4;
+  text-decoration: none;
+}
+a:hover,
+a:focus {
+  color: #2f6ea7;
+}
+a:focus {
+  outline: thin dotted;
+  outline: 5px auto -webkit-focus-ring-color;
+  outline-offset: -2px;
+}