body {
    background-color: black;
    display: flex;
    align-items: center;
    margin: 0;
}

#video {
    width: 100%;
    height: 100%;
    max-height: 100%;
    max-width: 100%;
}

.fit-screen {
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
}