YOUTUBE RESPONSIVE

<style>
.taillevideoyoutube {
        width: 100%;
        margin: auto;}

.videoyoutube {
	position: relative;
	padding-bottom: 56.25%;
	padding-top: 30px;
	height: 0;
	overflow: hidden;
}

.videoyoutube iframe,  
.videoyoutube object,  
.videoyoutube embed {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}
</style>


<div class="taillevideoyoutube">
<div class="videoyoutube">
<iframe id="VIDEO_1" width="853" height="480" src="https://www.youtube.com/embed/fHSm_FgiqUM?enablejsapi=1&html5=1&rel=0" frameborder="0" allowfullscreen=""></iframe>
</div>
</div>