html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #fff;
  font-family: Arial, sans-serif;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}

.table {
  display: table;
  width:320px;
  height:480px;
}

.tr {
  display: table-row;
}

.td {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
}

#scene {
  display: inline-block;
  width: 400px;
  height: 400px;
}

#scene canvas {
  width: 100%;
  height: 100%;
}

@media (max-width: 480px) {
  #scene {
    width: 300px;
    height: 300px;
  }
}