body {
    background-color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

video {
    width: 1280px;
    height: 720px;
    max-width: 100%;
    max-height: 100%;
}

.hidden {
    display: none;
}