/* espace entre le body et le haut de la page */
h2 {
    height: 20vh;
    margin: 0;
}

body {
    min-height: 100vh;
    margin: 0;
}

header {
    position: relative;
    z-index: 1;
    height: 100vh;
    text-align: center;
    font-family: 'Courier New', Courier, monospace;
}

header .overlay {
    position: relative;
    z-index: -1;
    inset: 0;
}

header video {
    position: absolute;
    z-index: -2;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}