feat: responsive for web with sidebar and different styling for test ui on web

src/pages/student/Lessons.tsx

@@ -33,6 +33,8 @@ const DOTS = [
 const STYLES = `
   @import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;700;800;900&family=Nunito+Sans:wght@400;600;700&display=swap');
 
+  :root { --content-max: 1100px; }
+
   .ls-screen {
     min-height: 100vh;
     background: #fffbf4;