html {
  height: 100%;
  width: 100%;
}
body {
  height: 100%;
  width: 100%;
  background-color: green;
}
.cha {
  position: absolute;
  left: 10%;
  width: 80%;
  font-size: 5em;
  color: blue;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
.meleon {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0%;
  top: 0%;
}