.video-custom-design iframe{
    width:100%;
    height: 600px;
}
@media (max-width: 767px) {
    .video-custom-design iframe{
       height: 500px;
    }
}
@media (min-width: 992px) {}@media (min-width: 768px) and (max-width: 991px) {}@media (max-width: 767px) {}