W3Schools Tryit Editor

<!doctype html>
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<body>
<h1>A Webpage Template</h1>
<p>You can use the <em>grid-area</em> property to name grid items.</p>
<p>You can refer to the name when you set up the grid layout, by using the <em>grid-template</em> property on the grid container.</p>
<p>This grid layout contains six columns and three rows:</p>
<div>
 <div>Header</div>
 <div>Menu</div>
 <div>Main</div> 
 <div>Right</div>
 <div>Footer</div>
</div>
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://www.w3schools.com/cssref/tryit.php?filename=trycss_grid-template3">(->オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://www.w3schools.com/cssref/tryit.php?filename=trycss_grid-template3" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>		
</body>
</html>