#conteneur3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: 100px 50px 50px;
    gap: 3px;
}

#conteneur3 div {
    display: flex;
    align-items: center;
    justify-content: center;
    border-style: solid;
    border-width: 1px;
}

#conteneur3 div:nth-child(odd) {
    background-color: rgb(227, 88, 88);
}

#conteneur3 div:nth-child(even) {
    background-color: rgb(122, 205, 130);
}