#player {
  font-size: 400%;
}

#instruction {
  font-size: 300%;
}

.button {
  width: 300px;
  height: 100px;
  background: #aaf";
  font-size: 200%;
  text-align: center;

  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  user-select: none;
}