.popin {
  position: fixed;
  z-index: 200;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);

  &:before {
    content: '';
    display: block;
    position: absolute;
    z-index: -1;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100vw;
    height: 100vh;
  }
  &:after {
    content: '';
    display: block;
    position: absolute;
    z-index: -1;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: white;
  }
}