.footer-button {
    display: inline-block;
    padding: 10px 20px;
    background-color: #ff0000;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    background-color: black; /* Ajout de la couleur de fond noir */
}

.footer-button .icon-white {
    display: inline-block;
    width: 20px;
    height: 20px;
    background-image: url(chemin/vers/picto-blanc.svg);
    /* Autres styles du pictogramme */
}