.video-responsive {
   height: 0;
    overflow: hidden;
    padding-bottom: 56.25%;
    position: relative;
 
    margin: 0px auto;
    /* max-width: 800px;*/
    width: 75%;
}
.video-responsive iframe {
   height: 100%;
   left: 0;
   position: absolute;
   top: 0;
   width: 100%;
}
@media (max-width: 767px) {
   .video-responsive {
       width: 100%;
   }
}