.content-video{max-width:1200px;margin:30px auto;padding:0;}

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

.video iframe{
position:absolute;
top:0;
left:5;
width:100%;
height:100%;
}

.goback{
position:absolute;
left:50%;
margin: 0px 0px 0px -25px; 
}