<table border="1">
<tr>
<th></th>
<th>ヘッダー</th>
<th>ヘッダー</th>
</tr>
<tr>
<th>ヘッダー</th>
<td>セル</td>
<td>セル</td>
</tr>
<tr>
<th>ヘッダー</th>
<td>セル</td>
<td>セル</td>
</tr>
</table>
body{
padding:30px;
}
table{
background:red;
width: 100vw;
height: 100vh;
}
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