body {
    background-color: black;
}

body > video {
    position:fixed;
    left:50%;
    top:50%;
    transform:translate(-50%, -50%);
}

@media screen and (max-width:1052px) {
    body > video {
        width: 100%;
    }
}

@media screen and (max-height: 592px) {
    body > video {
        height: 100%;
    }
}