/*媒体查询：注意and后面空格的添加*/
    /*iphone: w < 768px*/
    @media screen and (max-width: 768px){
        
     .sp_show
      {
      width:100%;height:300px;
      } 
 
     .sp_bt_an  { font-size:40px; position:absolute; left:50%;  top:20%;color:#ffffff;margin-left:-20px;z-index:2;  font-weight:normal;  }

        
    }
    
    /*pad: w >= 768  && w< 992*/
    @media screen and (max-width: 992px) and (min-width: 768px) {

   .sp_show
      {
      width:100%;height:300px;
      } 
        
         .sp_bt_an  { font-size:40px; position:absolute; left:50%;  top:40%;color:#ffffff;margin-left:-20px;z-index:2;  font-weight:normal;  }
   
        
    }
    /*中等屏幕   w >= 992  && w<1200*/
    @media screen and (max-width: 1200px) and (min-width: 992px) {

        
   .sp_show
      {
      width:100%;height:350px;
      }  
      
      
          .sp_bt_an  { font-size:40px; position:absolute; left:50%;  top:40%;color:#ffffff;margin-left:-20px;z-index:2;  font-weight:normal;  }

        
    }
    /*大屏幕   && w》1200*/
    @media screen and  (min-width: 1200px) {
        
        
      .sp_show
      {
      width:100%;height:400px;
      }  
      
      
          .sp_bt_an  { font-size:40px; position:absolute; left:50%;  top:40%;color:#ffffff;margin-left:-20px;z-index:2;  font-weight:normal;  }

       
        
    }
    
    
    
    .tu_sp
    {
    -webkit-filter: brightness(70%);
    filter: brightness(70%);
    }
    .content-display-show
    {
    margin-top:20px; margin-bottom:20px;

    }
    .content-display-show h3  { text-align:center;font-size:15px;background:#ffffff;color:#444444;height:50px;line-height:50px;margin-top:-0px;-moz-box-shadow:2px 2px 5px #f2f2f2; -webkit-box-shadow:2px 2px 5px #f2f2f2; box-shadow:2px 2px 5px #f2f2f2;}