CSS 气泡写法

    
    
    
 
 
 
     .triangle{
  width:0;
  height:0;
  border-width:0 50px 50px;
  border-style:solid;
  border-color:transparent transparent #999;
  margin: -50px auto;
  position:relative;
     }

     .triangle span{
  display:block;
  width:0;
  height:0;
  border-width:0 49px 49px;
  border-style:solid;
  border-color:transparent transparent #2B9FF8;
  position:absolute;
  top:1px;
  left:-49px;
     }

     .tooltip {
  width: 400px;
  height: 250px;
  border: solid #999 1px;
  margin: 200px auto;
  background-color: #2B9FF8;
  border-radius: 15px;
     }