Der Inhalt der Tabelle in HTML wird horizontal und vertikal in der Mitte angezeigt

#class td /*设置表格文字左右和上下居中对齐*/ 
{  
    vertical-align: middle;
    text-align: center;  
}
/*class 是所属的类*/
<p id="class" align="center" style= "margin: 0cm 0cm 0pt; text-align: left">                                                                      
<table class="table table-bordered" border="1" width="100%" style="font-size: 14pt; color: #000000; font-family: 楷体;mso-ascii-font-family: &#39;times new roman&#39;; mso-hansi-font-family: &#39;times new roman&#39;">                                                             
<caption><h2 style="text-align: left;font-size: 16pt;font-family: 宋体;color: red;">title</h2><
/caption>                                                              
<tbody >                                                                 
<tr style="font-weight: bold;mso-bidi-font-size: 12.0pt;font-family: 宋体;" >                                                                      
<td>序号</td>                                                                      
<td>适用情况</td>                                                                      
 <td>详情</td>                                                                       
<td>备注</td>                                                                   
 </tr>                                                                                                                                       
<tr>                                                                    
<td>1</td>                                                                     
<td>xxxxx</td>                                                                      
<td style="text-align: left;"> <!--指定靠左对齐-->                                                                     
 <span>                                                                             
xxxxxx<br>                                                                                                                                                        
</span>                                                                      
</td>                                                                       
<td><a href="#">查看详情</a>
</td>                                                              
</tr>                                                
</tbody>                                                          
</table> 
</p>