body{background-color:#222;margin:0;overflow:hidden;width:100vw;height:100vh;--computed-width:100vw;--computed-height:100vh}.placeholder{font-family:sans-serif;color:#fff;text-align:center}#media-elements{width:100vw;height:100vh;display:flex;flex-wrap:wrap;justify-content:center;align-items:center}video{width:var(--computed-width);height:var(--computed-height)}