#test > .visible {
    visibility: visible;
    opacity: 1;
    transition: opacity 2s linear;
  }

#test > .hidden {
    visibility: hidden;
    width: 0px;
    height: 0px;
    margin: 0px;
    opacity: 0;
    transition: visibility 0s 2s, opacity 2s linear, height 2s linear, width 2s linear;

  }