body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
}

#content {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

video {
    width: 100%;
    height: auto;
}

#message {
    color: white;
    font-size: 2em;
    text-align: center;
    position: absolute;
}

.hidden {
    display: none;
}