@media screen and (max-width: 800px)
{
    #domaine_expertise .container {
        grid-template-columns: repeat(auto-fit,minmax(200px,50%) );
    }

    section .container {
        margin: 30px 0 30px 0;
        padding: 0 3% 0 3%;
    }

    #domaine_expertise article {
        margin: 3%;
    }

}