[垂直居中] #css

vertical-center.scss

.tip-mask {
  z-index: 200;
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.4);
  
  .update-tip {
    font-size: px2rem(30);
    background-color: #fff;
    border-radius: px2rem(10);
    position: relative;

    width: 70%;
    left: 50%;
    top: 50%;

    transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%); 	/* IE 9 */
    -moz-transform:translate(-50%,-50%); 	/* Firefox */
    -webkit-transform:translate(-50%,-50%); /* Safari 和 Chrome */
    -o-transform:translate(-50%,-50%); 	/* Opera */
}
  
.buy-lottery-record {
    width: 6.5rem;
    height: 7.62rem;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}