.frame {
	position: relative;
	width: 100%;
	 height: 0;
	padding-top: 50%; 
}
.frame iframe {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%; 
}

/* PC */
@media only screen and (min-width: 961px) { 
.frame {
	padding-top: 45%; 
	}
}