.button-3d {
display: inline-block;
padding: 12px 24px;
font-size: 16px;
font-weight: bold;
color: #fff;
background: linear-gradient(145deg, #e74c3c, #c0392b);
border: none;
border-radius: 8px;
box-shadow: 6px 6px 12px #c0392b, -6px -6px 12px #e74c3c;
text-decoration: none;
transition: all 0.3s ease;
}
.button-3d:hover {
box-shadow: inset 6px 6px 12px #c0392b, inset -6px -6px 12px #e74c3c;
}