.ip-ratio-box {
	position: relative;
	height: 0;
	display: block;
	width: 100%;
	/* padding-bottom is calculated and rendered in to HTML */
}

.ip-ratio-box img,
.ip-ratio-box iframe,
.ip-ratio-box video {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	display: block;
}