refactor: Adjust the css of highlight

source/css/_highlight/highlight.styl

@@ -97,43 +97,43 @@ for lang in languages
         background-color: $highlight-side-bg-color
         counter-increment: line
 
-.variable,
-.attribute
-  color: $highlight-red
-
-.number,
-.preprocessor,
-.literal,
-.params,
-.constant,
-.number,
-.command
-  color: $highlight-orange
-
-.built_in
-  color: $highlight-yellow
-
-.special,
-.formula,
-.class,
-.string,
-.value,
-.inheritance,
-.header,
-.regexp,
-.tag
-  color: $highlight-green
-
-.keyword,
-.title
-  color: $highlight-aqua
-
-.function,
-.title
-  color: $highlight-blue
-
-.comment
-  color: $highlight-comment
+  .variable,
+  .attribute
+    color: $highlight-red
+
+  .number,
+  .preprocessor,
+  .literal,
+  .params,
+  .constant,
+  .number,
+  .command
+    color: $highlight-orange
+
+  .built_in
+    color: $highlight-yellow
+
+  .special,
+  .formula,
+  .class,
+  .string,
+  .value,
+  .inheritance,
+  .header,
+  .regexp,
+  .tag
+    color: $highlight-green
+
+  .keyword,
+  .title
+    color: $highlight-aqua
+
+  .function,
+  .title
+    color: $highlight-blue
+
+  .comment
+    color: $highlight-comment
 
 .ruby .constant,
 .xml .tag .title,