#gamebox{
	text-align: center;
}
#gamebox img {
	max-width: 640px;
}

#gamebox .responsive-video {
	width: min(100%, 560px);
	margin: 0 auto;
	aspect-ratio: 16 / 9;
}

#gamebox .responsive-video iframe {
	width: 100%;
	height: 100%;
	border: 0;
	display: block;
}