.overlay {
  position: fixed;
  display: block;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 50;

  width: 100vw;
  height: 100vh;

  &--visible {
    background: #555;
    opacity: .6;
  }

  @media screen and (min-width: 600px) {
    cursor: pointer;
  }
}