fix(scss): prevent HLJS default text and bg colors getting overrided

wowchemy/assets/scss/wowchemy/_base.scss

@@ -208,6 +208,7 @@ code {
 pre,
 code:not(.hljs) {
   color: #c7254e;
+
   /* Match bg of default highlight theme. */
   background-color: rgb(248, 248, 248);
 }