#grille {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    margin: 0;
    padding: 0;
}

#grille figure {
    width: 31%;
}

@media (max-width: 700px) {
    #grille figure {
        width: 46%;
    }
}

@media (max-width: 450px) {
    #grille figure {
        width: 84%;
    }
}