* {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  margin: 10px;
}

.gamepad {
  /* canvas size: 1053 × 745 */
  max-height: 745px;
  max-width: 1053px;
}

.centre {
  display: -webkit-box;   /* iOS 6-, Safari 3.1-6 */
  display: -moz-box;      /* Firefox 2-21 */
  display: -ms-flexbox;   /* IE 10+ */
  display: -webkit-flex;  /* Chrome 4-20 */
  display: flex;          /* Chrome 21+, Firefox 20+, Opera 12.1+ */

  /* old way */
  -ms-box-align: center;
  -ms-flex-align: center;
  -moz-box-align: center;
  -webkit-box-align: center;
  align-self: center;
  -ms-align-self: center;
  -moz-align-self: center;
  -webkit-align-self: center;

  /* new way */
  align-items: center;
  justify-content: center;
}