body {
  overflow: hidden;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  background-color: #eee;
  -webkit-transition: background-color 1s ease-in-out;
  transition: background-color 1s ease-in-out;
}

#c {
  position: relative;
  z-index: 1;
  -webkit-filter: contrast(3);
          filter: contrast(3);
}

h1 {
  width: 100vw;
  height: 100vh;
  position: absolute;
  z-index: 2;
  color: #eee;
  -webkit-transition: color 1s ease-in-out;
  transition: color 1s ease-in-out;
  font-size: 8em;
  text-align: center;
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
          align-items: center;
  -webkit-box-pack: center;
          justify-content: center;
  cursor: pointer;
}

p#clickHere {
  text-transform: uppercase;
  padding: 1em;
}