#center_column #li_bref .box-white#bref_accessoires {
    padding: 10px 20px 30px 20px;
}

@media only screen and (max-width: 511px) {
    #center_column .box-white#bref_accessoires .h2 {
        margin: 0 15px 8px;
    }
    #center_column #li_bref .box-white#bref_accessoires div {
        bottom: 0;
    }
}