.nav-item {
    opacity: 0;
    transform: translateY(70px);
    transition: opacity 1s ease, transform 1s ease;
}

.liens-reseaux {
    opacity: 0;
    transform: translateY(0vh);
    transition: opacity 2.2s ease, transform 2.2s ease;
}
#logo-centre {
    transform: translate(-50%, -200%);
    opacity: 0;
}