.overlay {
  display: block;
  opacity: 0;
  position: absolute;
  left: 0;
  right: 100vw;
  top: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 998;
  transition: .2s opacity, 0s display .2s; }
  .overlay.visible {
    right: 0;
    opacity: 1;
    transition: .2s opacity; }

.over-overlay {
  z-index: 1001;
  -webkit-transform: translate3d(0, 0, 1px);
          transform: translate3d(0, 0, 1px); }