#mask {
  position: fixed;
  top: 0px;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.55) none repeat scroll 0% 0%;
  z-index: 100000;
  display: block;

}
#mask .content{
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  width: 300px;
  height: 300px;
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  border-radius: 20px;
}
#mask .content>img{
  width: 200px;
  height: 200px;
}
#mask .content>div{
  margin-top: 24px;
  font-size: 16px;
}