.pdf-viewer-area iframe{width:100%;height:700px;}

.iframe-box{padding:20px 0;}
.iframe-box .fr-video{display:block;position:relative;padding-bottom:56.25%;height:0;overflow:hidden;}
.iframe-box .fr-video iframe{position:absolute;top:0;left:0;width:100% !important;height:100% !important;}

@media screen and (max-width: 768px) {
	.pdf-viewer-area iframe{height:500px;}
}