.diplomes {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

section {
    position: relative;
}

.diplomes img {
    width: 48%;
    object-fit: contain;
    border: 1px solid black;
    margin-bottom: 1rem;
}

main {
    position: relative;
    z-index: -2;
    background-color: #eee;
}

@media screen and (max-width: 900px) {
    .diplomes img {
        width: 98%;
    }
}