.banniere {
    background-color: var(--md-sys-color-secondary);
    color:var(--md-sys-color-on-secondary);
    text-align:center;
}

.accueil {
    overflow: hidden;
    width:100%;
}


main {
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
}