html,body{
  font: 14px "microsoft yahei","Times New Roman","宋体",Times,serif;
}
.helppage{
  padding: 0 25px;
}
h3{
  font-size: 20px;
}
.helppage .img img{
  cursor: pointer;
}
.shade{
  position: fixed;
  top:0;
  left:0;
  right:0;
  width: 100%;
  height:100%;
  display: none;
  background: rgba(0,0,0,0.6);
}
.bigtu{
  position: fixed;
  top:20px;
  left:50%;
  margin-left:-500px;
  width:1000px;
  display: none;
}
.bigtu img{
  width: 1000px;
  display: block;
}
.close{
  position: fixed;
  top:6px;
  right:26px;
  font-size: 40px;
  color:#fff;
  z-index: 10;
  cursor: pointer;
}
.close:hover{
  color:#33e61b;
}