.new_div {
	/* 90% of viewport vidth */
	height: 100vw;
	/* ratio = 9/16 * 90 = 50.625 */
	background: none;
	max-height: 95vh;
	/* 16/9 * 90 = 160 */
	margin: auto;
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
}