header {
    position: fixed;
    top: 3rem;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    z-index: 10;
    transform: translateY(-100%);
    transition: 1000ms ease;
}

header.active {
    transform: translateY(0);
}

header video {
    width: auto;
    height: 5rem;
    transform: translateY(-.5rem);
}
@media only screen and (min-width: 1024px) {
    header {
        top: 0;
        right: 3rem;
    }

    header video {
        transform: translateY(-1rem);
        height: 6rem;
    }
}