html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  min-height: 100vh;
}
body {
  text-align: center;
}
img {
  -ms-interpolation-mode: bicubic;
}

#scratch {
  position: relative;
  display: inline-block;
  font-size: 0;
  margin-top: 100px;
  margin-bottom: 600px;
}
#scratch img {
  width: 100%;
  max-width: 916px;
  height: auto;
}
#scratch canvas {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  cursor: pointer;
  will-change: transform;
  transform: translate3d(0,0,0);
  -ms-touch-action: none;
  -webkit-touch-action: none;
  -moz-touch-action: none;
  touch-action: none;

  transition: opacity 500ms ease-out 0ms, height 0ms linear 500ms;
}
#scratch.revealed canvas {
  opacity: 0;
  height: 0;
}