img { width: 55%; float: center; margin-right: 2em; } *:fullscreen, :-ms-fullscreen { box-sizing: border-box; width: 100%; height: 100%; object-fit: contain; } :-webkit-full-screen { background: #000000; } :-moz-full-screen { background: #000000; } :-ms-fullscreen { background: #000000; witdh: 100%; margin: 1em auto; object-fit: contain; } :fullscreen { /* spec */ background: #000000; }