use css variables to change code on light mode

Author: HomelessDinosaur

src/components/code/Pre.tsx

@@ -34,7 +34,7 @@ const Pre: React.FC<Props> = ({
   const fileName = meta(highlighted).file
 
   let handlers = [callout, fold, collapse, collapseTrigger, collapseContent]
-  // TODO: Fix transitions, they currently break colours in the code when switching languages
+
   if (enableTransitions) {
     handlers = [...handlers, tokenTransitions]
   }