feat(blog) add footer for post reading part

frontend/app/blog/layout.tsx

@@ -7,7 +7,7 @@ function Layout({
 }) {
     return (
         // <div className={ 'flex flex-auto p-7 pl-2 md:pl-7 items-stretch justify-center' }>
-        <div className={ 'flex flex-auto p-7 pl-2 md:pl-7 w-full justify-center' }>
+        <div className={ 'flex flex-auto p-7 pl-2 lg:pl-7 w-full justify-center' }>
             { children }
         </div>
     );