.box_video_banner {
	display: block;
	position: relative; 
	height: auto; overflow: hidden; 
	padding-bottom: 56.25%; 
	margin: 0;
}
.box_video_banner iframe {
	position: absolute; 
	top: 0; 
	left: 0; 
	width: 100%; 
	height: 100%;
}