html,body,div {
  margin: 0px;
  padding: 0px;
  font-size: 50px;
}
body {
  width: 320px;
  margin: auto;
  background-color: #333;
}
div.container {
  background-color: #FFF;
}
a#start {
  width: 320px;
  height: 880px;
  display: block;
  background: url(../img/intro.png);
  background-size: contain;
}
div#play {
  width:320px;
  height:480px;
  display: none;
}
img{
  max-width:320px;
}
div.center{
  text-align: center;
}
form{
  margin: auto;
}