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

#gamepad {
  width: 100vw;
  height: 100vw;
}

#startButton {
  border: 1px solid black;
  width: 80%;
  margin: auto;

  margin-top: 20%;
  padding: 15px;
  text-align: center;
}