html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
}

video {
    position: absolute;
    left: 0;
    top: 0;
    height: 100vh;
    width: 100vw;
    object-fit: cover;
    z-index: -100;
}

h3 {
    color: #fff;
}

.box {
    background: rgba(0,0,0,0.5);
    padding: 8pt;
    border-radius: 8pt;
}