feat: Quests page responsiveness and sidebar enhancements

src/pages/student/lessons/EBRWVocabMeaningLesson.tsx

@@ -185,7 +185,7 @@ const EBRWVocabMeaningLesson: React.FC<LessonProps> = ({ onFinish }) => {
 
   return (
     <div className="flex flex-col lg:flex-row min-h-screen">
-      <aside className="w-full lg:w-64 lg:fixed lg:top-14 lg:bottom-0 lg:overflow-y-auto p-4 border-r border-slate-200 bg-slate-50 z-0 hidden lg:block">
+      <aside className="w-full lg:w-64 lg:fixed lg:top-14 lg:bottom-0 lg:overflow-y-auto p-4 border-r border-slate-200 bg-slate-50 lg:bg-transparent z-0 hidden lg:block">
         <nav className="space-y-2 pt-6">
           <SectionMarker
             index={0}