main .fondPhoto {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
        url('../che44/seanceSpecialeChevaliers3.webp'),
        no-repeat, center;
    background-attachment: fixed;
}
footer {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
        url('../che44/seanceSpecialeChevaliers3.webp'),
        no-repeat, center;     
    background-attachment: fixed;
}
header nav ul {
    margin : 0;
    display: flex;
}
h1.fondPhoto {
    font-size: 100px;
}