Add highlight.js 8.3 from the highlight.js standalone repo.

highlight_js_8.3.0/styles/atelier-forest.dark.css

+/* Base16 Atelier Forest Dark - Theme */
+/* by Bram de Haan (http://atelierbram.github.io/syntax-highlighting/atelier-schemes/forest) */
+/* Original Base16 color scheme by Chris Kempson (https://github.com/chriskempson/base16) */
+/* https://github.com/jmblog/color-themes-for-highlightjs */
+
+/* Atelier Forest Dark Comment */
+.hljs-comment,
+.hljs-title {
+  color: #9c9491;
+}
+
+/* Atelier Forest Dark Red */
+.hljs-variable,
+.hljs-attribute,
+.hljs-tag,
+.hljs-regexp,
+.ruby .hljs-constant,
+.xml .hljs-tag .hljs-title,
+.xml .hljs-pi,
+.xml .hljs-doctype,
+.html .hljs-doctype,
+.css .hljs-id,
+.css .hljs-class,
+.css .hljs-pseudo {
+  color: #f22c40;
+}
+
+/* Atelier Forest Dark Orange */
+.hljs-number,
+.hljs-preprocessor,
+.hljs-pragma,
+.hljs-built_in,
+.hljs-literal,
+.hljs-params,
+.hljs-constant {
+  color: #df5320;
+}
+
+/* Atelier Forest Dark Yellow */
+.hljs-ruby .hljs-class .hljs-title,
+.css .hljs-rules .hljs-attribute {
+  color: #d5911a;
+}
+
+/* Atelier Forest Dark Green */
+.hljs-string,
+.hljs-value,
+.hljs-inheritance,
+.hljs-header,
+.ruby .hljs-symbol,
+.xml .hljs-cdata {
+  color: #5ab738;
+}
+
+/* Atelier Forest Dark Aqua */
+.css .hljs-hexcolor {
+  color: #00ad9c;
+}
+
+/* Atelier Forest Dark Blue */
+.hljs-function,
+.python .hljs-decorator,
+.python .hljs-title,
+.ruby .hljs-function .hljs-title,
+.ruby .hljs-title .hljs-keyword,
+.perl .hljs-sub,
+.javascript .hljs-title,
+.coffeescript .hljs-title {
+  color: #407ee7;
+}
+
+/* Atelier Forest Dark Purple */
+.hljs-keyword,
+.javascript .hljs-function {
+  color: #6666ea;
+}
+
+.hljs {
+  display: block;
+  overflow-x: auto;
+  background: #2c2421;
+  color: #a8a19f;
+  padding: 0.5em;
+  -webkit-text-size-adjust: none;
+}
+
+.coffeescript .javascript,
+.javascript .xml,
+.tex .hljs-formula,
+.xml .javascript,
+.xml .vbscript,
+.xml .css,
+.xml .hljs-cdata {
+  opacity: 0.5;
+}