.grille{
    max-width: 1300px;
    width: 80%;
    height: auto;
    margin: 30px auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, 300px);
    grid-gap: 10px 10px;
    justify-content: center;
}

.grid-item, .example-image{
    width: 300px;
    height: 200px;
    background-color: #333;
}