#videoDiv{width:100%;height:auto;position:relative}#videoBlock{width:100%;height:100%;display:flex;justify-content:center;align-items:center}#videoBlock video{width:100%}#videoMessage{width:100%;height:100%;position:relative;top:0;left:0}#v0{display:none}#videosubstitute{display:block;width:100%;height:auto}@media (min-width: 768px){#v0{display:block}#videosubstitute{display:none}#videoMessage{position:absolute}}