fix css issue

Author: dragoncoder047

static/css/prism.css

@@ -84,6 +84,8 @@ https://prismjs.com/download.html#themes=prism-tomorrow&languages=clike+javascri
 pre[data-line] {
     position: relative;
     padding: 1em 0 1em 3em;
+    z-index: 1;
+    background: none; /* Allow the line highlight to shine through */
 }
 
 .line-highlight {
@@ -95,7 +97,6 @@ pre[data-line] {
     /* Same as .prism’s padding-top */
 
     background: #706000;
-    z-index: -1; /* Show text over it; */
 
     pointer-events: none;