.b1{
  position:fixed;
  width:100%;
  height:100%;
  top:0px;
  background:rgba(0,0,0,0.8);
  overflow: hidden;
  z-index: 1000;
}
.t_w{
  position:relative;
}
.b2{
  width: 90%;
  margin:55% auto;
  overflow: hidden;
  border-radius: 10rpx;
}
.t_image{
  width: 100%;
  display: block;
  margin: 0 auto;
}
.cancel_icon{
  position: absolute;
  right: 30rpx;
  top: -30rpx;
}