.nyvideolist{display:flex;justify-content:space-between;flex-wrap:wrap;}
.nyvideolist li{width:48%;margin-bottom:30px;position:relative;padding-bottom:30%;}
.nyvideolist li iframe{width:100%;height:100%;position:absolute;top:0;left:0;}
@media (max-width:768px){.nyvideolist li{width:100%;padding-bottom:65%}}