html, head, body {
    margin: 0;
}

main {
    background: rgba(0,0,0,0.5);
    width: 100%;
    height: 100vh;
    min-height: 100vh;
}

#sub{
    background: rgba(0,0,0,0.5);
    width: 100%;
    height: 50vh;
    min-height: 50vh;
}

.title-video {
    position: absolute;
    top:0;
    left: 0;
    z-index: -1;

    width: 100%;
    height: 100%;

    object-fit: cover;
    object-position: center;

    color: #fff;
}

#sub div .title-video {
    position: absolute;
    top:0;
    left: 0;
    z-index: -1;

    width: 100%;
    height: 50vh;

    object-fit: cover;
    object-position: center;

    color: #fff;
}

@media (max-width: 1000px) {
    main {
        max-height: calc(100vh - 60px);
    }
}