素材管理（#99） (#303)

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Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #303

frontend/src/components/layout/MainArea.tsx

@@ -8,6 +8,8 @@ type Props = {
 
 
 export default (({ children, className }: Props) => (
-    <main className={cn ('flex-1 overflow-y-auto p-4', className)}>
+    <main className={cn ('flex-1 overflow-y-auto p-4',
+			 'md:h-[calc(100dvh-88px)] md:overflow-y-auto',
+			 className)}>
       {children}
     </main>)) satisfies FC<Props>