html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

div {
  width: 100%;
  height: 100%;
  max-height: 100%;
  margin: 0;
  padding: 0;
  background-image: url('sadandfat.png');
  background-size: 100% 100%;
  background-repeat: no-repeat;
}