.pdfviewer {
	margin:1% 0;
	border:1px solid #aaa;
	height:1400px;
	width:990px;
}
.youtube_video {
    position: relative;
    width: 100%;
    max-width: 90rem;
    padding-top: 56.25%;
    margin: 2rem auto 0;
}
#youtube_link {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
@media (max-width:767px){ 
	.pdfviewer { 
		height:350px;
	}
}