body,
html {
  width: 100%;
  height: 100%;
}

#drm-player {
  width: 100%;
  height: 100%;
}

#drm-player.amp-default-skin .vjs-big-play-button {
  top: calc(50% - 0.1em / 2);
  left: calc(50% - 0.1em / 2);
}