Update markup/styling for syntax highlight theme preference

app/assets/stylesheets/pages/profiles/preferences.scss

@@ -37,22 +37,20 @@
   }
 }
 
-.code_highlight_opts {
-  margin-top: 10px;
-
+.syntax-theme {
   label {
     margin-right: 20px;
     text-align: center;
 
-    .prev {
-      width: 160px;
+    .preview {
       margin-bottom: 10px;
+      width: 160px;
 
       img {
-        max-width: 100%;
         @include border-radius(4px);
+
+        max-width: 100%;
       }
     }
   }
 }
-

app/views/profiles/preferences/show.html.haml

@@ -16,9 +16,9 @@
           = f.radio_button :theme_id, theme.id
           = theme.name
 
-  .panel.panel-default.code-preview-theme
+  .panel.panel-default.syntax-theme
     .panel-heading
-      Code preview theme
+      Syntax highlighting theme
     .panel-body
       - color_schemes.each do |color_scheme_id, color_scheme|
         = label_tag do