.graph-photos {
    display: flex;
    flex-wrap: wrap;
}

.photo-equipe {
    position: relative;
    overflow: hidden;
    height: 56.25%;
    width: 50%;
    border: 5px solid #fff;
}

.photo-equipe:nth-of-type(1), .photo-equipe:nth-of-type(2), .photo-equipe:nth-of-type(3) {
    width: 33.3333%;
}

@media (max-width: 991px) {
    .photo-equipe:nth-of-type(1), .photo-equipe:nth-of-type(2), .photo-equipe:nth-of-type(3) {
        width: 50%;
    }

    .photo-equipe:last-of-type {
        width: 100%;
    }
}

@media (max-width: 767px) {
    .photo-equipe:nth-of-type(1), .photo-equipe:nth-of-type(2), .photo-equipe:nth-of-type(3) {
        width: 100%;
    }

    .photo-equipe {
        width: 100%;
    }
}