css完成多张照片横向垂直居中显示信息的方式

   <div class="main">
  <div class="tag">
   归类小贴士
  </div>
  <div class="images" >
   <div class="mid">
    <img src="images/06.jpg" />
   </div>
   <div class="mid">
    <img src="images/05.jpg" />
   </div>
   <div class="mid">
    <img src="images/07.jpg" />
   </div>
   <div class="mid">
    <img src="images/11.jpg" />
   </div>
   <div class="mid">
    <img src="images/14.jpg" />
   </div>
  </div>
  <div style="clear:both;"></div>
  <div style="margin-bottom:30px;">
  </div>

 .main{
  width:100%;
  margin-top:40px;
 }
 .main .tag{
  margin:0 auto;
  width:200px;
  font-size:18px;
  border-bottom:1px solid #878787;
  text-align:center;
  margin-bottom:20px;
 }
 .main .images{ 
        margin:0 auto;
  width:1300px;//设定<div>块的尺寸，要完成垂直居中实际效果必须历经测算
 }
 .main .images .mid{
     float: left;//设定左对齐
     margin:5px;//照片边沿间距
 }  
 .main .images .mid img{
     width:250px;//标准照片长宽
     height:300px;
 }