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HTML 

              
                <section id="calendar-2" class="widget widget_calendar">
		<div id="calendar_wrap" class="calendar_wrap">
				<table id="wp-calendar">
						<caption>
						2020年3月
						</caption>
						<thead>
								<tr>
										<th scope="col" title="月曜日">月</th>
										<th scope="col" title="火曜日">火</th>
										<th scope="col" title="水曜日">水</th>
										<th scope="col" title="木曜日">木</th>
										<th scope="col" title="金曜日">金</th>
										<th scope="col" title="土曜日">土</th>
										<th scope="col" title="日曜日">日</th>
								</tr>
						</thead>
						<tfoot>
								<tr>
										<td colspan="3" id="prev"><a href="https://tatsuya-lab.com/2020/02/">&laquo; 2月</a></td>
										<td class="pad">&nbsp;</td>
										<td colspan="3" id="next" class="pad">&nbsp;</td>
								</tr>
						</tfoot>
						<tbody>
								<tr>
										<td colspan="6" class="pad">&nbsp;</td>
										<td><a href="https://tatsuya-lab.com/2020/03/01/" aria-label="2020年3月1日 に投稿を公開">1</a></td>
								</tr>
								<tr>
										<td><a href="https://tatsuya-lab.com/2020/03/02/" aria-label="2020年3月2日 に投稿を公開">2</a></td>
										<td>3</td>
										<td><a href="https://tatsuya-lab.com/2020/03/04/" aria-label="2020年3月4日 に投稿を公開">4</a></td>
										<td>5</td>
										<td><a href="https://tatsuya-lab.com/2020/03/06/" aria-label="2020年3月6日 に投稿を公開">6</a></td>
										<td><a href="https://tatsuya-lab.com/2020/03/07/" aria-label="2020年3月7日 に投稿を公開">7</a></td>
										<td><a href="https://tatsuya-lab.com/2020/03/08/" aria-label="2020年3月8日 に投稿を公開">8</a></td>
								</tr>
								<tr>
										<td>9</td>
										<td><a href="https://tatsuya-lab.com/2020/03/10/" aria-label="2020年3月10日 に投稿を公開">10</a></td>
										<td><a href="https://tatsuya-lab.com/2020/03/11/" aria-label="2020年3月11日 に投稿を公開">11</a></td>
										<td><a href="https://tatsuya-lab.com/2020/03/12/" aria-label="2020年3月12日 に投稿を公開">12</a></td>
										<td><a href="https://tatsuya-lab.com/2020/03/13/" aria-label="2020年3月13日 に投稿を公開">13</a></td>
										<td><a href="https://tatsuya-lab.com/2020/03/14/" aria-label="2020年3月14日 に投稿を公開">14</a></td>
										<td><a href="https://tatsuya-lab.com/2020/03/15/" aria-label="2020年3月15日 に投稿を公開">15</a></td>
								</tr>
								<tr>
										<td><a href="https://tatsuya-lab.com/2020/03/16/" aria-label="2020年3月16日 に投稿を公開">16</a></td>
										<td><a href="https://tatsuya-lab.com/2020/03/17/" aria-label="2020年3月17日 に投稿を公開">17</a></td>
										<td id="today">18</td>
										<td>19</td>
										<td>20</td>
										<td>21</td>
										<td>22</td>
								</tr>
								<tr>
										<td>23</td>
										<td>24</td>
										<td>25</td>
										<td>26</td>
										<td>27</td>
										<td>28</td>
										<td>29</td>
								</tr>
								<tr>
										<td>30</td>
										<td>31</td>
										<td class="pad" colspan="5">&nbsp;</td>
								</tr>
						</tbody>
				</table>
		</div>
</section>
!

CSS 

              
                #calendar_wrap{
	padding-top:10px;
}
#wp-calendar{
	width: 100%;
	font-size:12px;
	padding-top: 10px;
}
#wp-calendar tr{
	display: flex;
	justify-content: flex-start;
}
#wp-calendar tr:first-of-type{
	justify-content: flex-end;
}
#wp-calendar th,
#wp-calendar td{
	display: block;
	width: calc(100% / 7);
	text-align: center;
	margin-bottom: 10px;
}
#wp-calendar td:last-of-type,
#wp-calendar th:last-of-type{
	color: red;
}
#wp-calendar td a{
	padding: 0;
}
#wp-calendar tfoot tr{
	display: flex;
	justify-content: center;
}
#wp-calendar tfoot tr td{
	width: calc(100% / 3);
}
#wp-calendar #today a,
#wp-calendar #today{
	color: white;
	background-color:#6699ff;
	font-weight:bold;
}
!

JS
!
999px

Console