.iron-btn {
    display: inline-block;
    color: #fff;
    padding: 10px 20px;
    margin-top: 15px;
    border-radius: 8px;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    transition: 0.3s;
}

/* Couleurs spécifiques */
.btn-blue { background:#1e3a8a; }       /* bleu */
.btn-blue:hover { background:#162c6a; }

.btn-orange { background:#f97316; }     /* orange */
.btn-orange:hover { background:#d95f0d; }

.btn-gold { background:#d4af37; }       /* or */
.btn-gold:hover { background:#b9972e; }

.btn-box { text-align:center; margin-top:15px; }