Simple CSS Collapse Technique

simpleCollapse.css

.simpleCollapse {
  max-height: 0;
  overflow: hidden;

  -webkit-transform: scaleY(0) translate3d(0,0,0);
  -ms-transform: scaleY(0) translate3d(0,0,0);
  -o-transform: scaleY(0) translate3d(0,0,0);
  transform: scaleY(0) translate3d(0,0,0);

  -webkit-transform-origin: top left;
  -moz-transform-origin: top left;
  -ms-transform-origin: top left;
  -o-transform-origin: top left;
  transform-origin: top left;

  -webkit-transition: all 0.25s;
  -o-transition: all 0.25s;
  transition: all 0.25s;
}

.simpleCollapse.open {
  max-height: 99999px;
  -webkit-transform: scaleY(1);
  -ms-transform: scaleY(1);
  -o-transform: scaleY(1);
  transform: scaleY(1);
}