.mask-layer {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    background: #000;
    opacity: 0.2;
    overflow: hidden;
    z-index: 1000;
    color: #fff;
  }
  .pop-common {
    width: 100%;
    overflow: hidden;
    position: fixed;
    bottom: 0;
    left: 0;
    z-index: 2000;
    background: #fff;
  }