<style>
table.cal, tr, td {
padding:4px;
}
tr.fish {
background-color:#F3F6FF;
}
td.mon span {
background-color:#557766;
color:#FFFFFF;
display:block;
}
</style>
<table class="cal">
<tbody>
<tr class="fish">
<td class="mon"><span>1</span></td>
<td class="mon">2</td>
<td class="mon">3</td>
</tr>
<tr>
<td class="mon">4</td>
<td class="mon"><span>5</span></td>
<td class="mon">6</td>
</tr>
<tr class="fish">
<td class="mon">7</td>
<td class="mon">8</td>
<td class="mon"><span>9</span></td>
</tr>
</tbody>
</table>ネタ元
