.plan-du-site {
    width: 90%;
    margin-left: auto;
    margin-right: auto;
}

.plan-du-site h1 {
    margin-left: 0;
    margin-right: auto;
    margin-top: 4rem;
    margin-bottom: 1.5rem;
}

.plan-du-site h2 {
    margin-top: 4rem;
    margin-bottom: 1.5rem;
}

.plan-du-site nav {
    width: 100%;
    margin-left: 0;
    margin-right: auto;
}


@media (min-width: 1024px) {
    .plan-du-site {
        width: 60%;
    }
}