Code highlights: accent color at 15% opacity.

Author: steveluscher

site/css/graphql.css

@@ -1237,7 +1237,7 @@ pre[class*="language-"],
 }
 
 .line-highlight {
-  background-color: #fbf8f8;
+  background-color: rgba(229, 53, 171, 0.15);
   left: 0;
   line-height: inherit;
   margin-top: 5px;