header {
    padding: 5rem 0 3rem;
    position: relative;
    overflow: hidden;
    background: linear-gradient(var(--black), var(--black2));
}

header video {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-width: 100%;
    min-height: 100%;
    opacity: 0.2;
}