body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.promo-box {
    background-color: #111827; /* cinza escuro */
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.promo-box:hover {
    background-color: #1f2937;
    transform: translateY(-5px);
    box-shadow: 0px 5px 15px rgba(0, 255, 136, 0.2);
}

footer {
    opacity: 0.7;
}