style(exam): remove debug borders and set auto height for content area

src/pages/exam/LargeScreen.tsx

@@ -14,11 +14,11 @@ const LargeScreen = () => {
   );
 
   return (
-    <Layout className="border-4 border-solid border-red-500">
-      <Row className="border-4 border-solid border-red-500">
+    <Layout className="h-full">
+      <Row>
         <DeviceArea className="border-4 border-solid border-red-500" />
       </Row>
-      <Row>
+      <Row className="h-full">
         <ContentAreaLarge />
       </Row>
       <ExamExitFeedback