.guize_html {            
    position: fixed;
   top: 25%;            
   left: 50%;           
    margin-top: -80px;            
    margin-left: -159px;            
    width: 318px;            
    height: auto;            
    border-radius: 4px;            
    background-color: #fff;            
    color: #000;            
    text-align: center;            
    font-size: 12px;        
}           
 .guize_html p {                
     padding: 0 10px;                
     text-align: left;                
     text-indent: 2em;            

 }        
 .guize_html_nei {            
     width: 318px;            
     min-height: 350px;            
     overflow-y: auto;            
     max-height: 500px;            
     height: 350px;            
     display: block;            
     overflow-y: scroll;        

 }        
 .btn {            
     display: block;           
      margin: 10px auto;            
      width: 240px;            
      height: 40px;            
      border-radius: 4px;            
      background-color: #ff6434;            
      color: #fff;            
      text-align: center;            
      line-height: 40px;            
      cursor: pointer;        }        
 .overfloat {           
      position: fixed;            
      top: 0;            
      left: 0;            
      z-index: 9;            
      display: none;            
      width: 100%;            
      height: 100%;            
      background-color: rgba(1,1,1,.5);        

 }