/*YOUTUBE RESPONSIVE*/
.youtube {
position: relative;
padding-bottom: 56.25%;
padding-top: 30px; height: 0; overflow: hidden;
}

.youtube iframe,
.youtube object,
.youtube embed {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
/*YOUTUBE RESPONSIVE*/


<div class="youtube"><iframe src="https://www.youtube.com/embed/q4y0KOeXViI" width="560" height="315" frameborder="0" allowfullscreen="allowfullscreen"></iframe></div>