Update highlight themes so they always have the correct colors

app/assets/stylesheets/highlight/dark.scss

 /* https://github.com/MozMorris/tomorrow-pygments */
-pre.code.highlight.dark,
 .code.dark {
 
-  background-color: #1d1f21;
-  color: #c5c8c6;
+  background-color: #1d1f21 !important;
+  color: #c5c8c6 !important;
 
-  pre.code,
+  pre.highlight,
   .line-numbers,
   .line-numbers a {
     background-color: #1d1f21 !important;
@@ -23,8 +22,8 @@ pre.code.highlight.dark,
 
   // Search result highlight
   span.highlight_word {
-    background: #ffe792;
-    color: #000000;
+    background-color: #ffe792 !important;
+    color: #000000 !important;
   }
 
   .hll { background-color: #373b41 }

app/assets/stylesheets/highlight/monokai.scss

 /* https://github.com/richleland/pygments-css/blob/master/monokai.css */
-pre.code.monokai,
 .code.monokai {
 
-  background: #272822;
-  color: #f8f8f2;
+  background-color: #272822 !important;
+  color: #f8f8f2 !important;
 
   pre.highlight,
   .line-numbers,
   .line-numbers a {
-    background:#272822 !important;
-    color:#f8f8f2 !important;
+    background-color :#272822 !important;
+    color: #f8f8f2 !important;
   }
 
   pre.code {
@@ -23,8 +22,8 @@ pre.code.monokai,
 
   // Search result highlight
   span.highlight_word {
-    background: #ffe792;
-    color: #000000;
+    background-color: #ffe792 !important;
+    color: #000000 !important;
   }
 
   .hll { background-color: #49483e }

app/assets/stylesheets/highlight/solarized_dark.scss

 /* https://gist.github.com/qguv/7936275 */
-pre.code.highlight.solarized-dark,
 .code.solarized-dark {
 
-  background-color: #002b36;
-  color: #93a1a1;
+  background-color: #002b36 !important;
+  color: #93a1a1 !important;
 
-  pre.code,
+  pre.highlight,
   .line-numbers,
   .line-numbers a {
     background-color: #002b36 !important;
@@ -23,7 +22,7 @@ pre.code.highlight.solarized-dark,
 
   // Search result highlight
   span.highlight_word {
-    background: #094554;
+    background-color: #094554 !important;
   }
 
   /* Solarized Dark

app/assets/stylesheets/highlight/solarized_light.scss

 /* https://gist.github.com/qguv/7936275 */
-pre.code.highlight.solarized-light,
 .code.solarized-light {
 
-  background-color: #fdf6e3;
-  color: #586e75;
+  background-color: #fdf6e3 !important;
+  color: #586e75 !important;
 
-  pre.code,
+  pre.highlight,
   .line-numbers,
   .line-numbers a {
     background-color: #fdf6e3 !important;
@@ -23,7 +22,7 @@ pre.code.highlight.solarized-light,
 
   // Search result highlight
   span.highlight_word {
-    background: #eee8d5;
+    background-color: #eee8d5 !important;
   }
 
   /* Solarized Light

app/assets/stylesheets/highlight/white.scss

 /* https://github.com/aahan/pygments-github-style */
-pre.code.highlight.white,
 .code.white {
-  background-color: #f8fafc;
-  font-size: 13px;
-  color: #5b6169;
-  line-height: 1.6em;
 
+  background-color: #f8fafc !important;
+  color: #5b6169 !important;
+
+  pre.highlight,
   .line-numbers,
   .line-numbers a {
     background-color: $background-color !important;
     color: $gl-gray !important;
   }
 
-  pre.highlight {
-    background-color: #fff !important;
-    color: #333 !important;
-  }
-
   pre.code {
     border-left: 1px solid $border-color;
+    background-color: #fff !important;
+    color: #333 !important;
   }
 
   // highlight line via anchor
@@ -28,7 +24,7 @@ pre.code.highlight.white,
 
   // Search result highlight
   span.highlight_word {
-    background: #fafe3d;
+    background-color: #fafe3d !important;
   }
 
   .hll { background-color: #f8f8f8 }