.pageContenu h4, .single .contenuZone h4 {
    font-size: 20px;
    color: #000000 !important;
    text-transform: inherit;
    font-weight: normal;
}

.pageContenu h2, .single .contenuZone h2 {
    font-size: 14px !important; 
    color: #000000 !important;
    text-transform: inherit;
    font-weight: bold;
}