.modal {
    top: 30%;
    left: 0%;
    width: 100vw;
    height: 100vh;
    position: relative;
    background: rgba(0, 0, 0, 0.5);
  }
  .child {
    top: 50%;
    left: 50%;
    width: 500px;
    height: 500px;
    background: white;
    position: relative;
    transform: translate(-50%, -50%);
  }