.btn {
    color: #f0f0f0;
    padding: 0.7em 1.7em;
    font-size: 18px;
    border-radius: 0.5em;
    background: #1a1a1a;
    border: 1px solid #1a1a1a;
    transition: all 0.3s;
    box-shadow: 6px 6px 12px #1a1a1a, -6px -6px 12px #000000;
    text-decoration: none;
    font-family: monospace;
}

.btn:active {
    color: #f0f0f0;
    box-shadow: inset 4px 4px 12px #000000,
                inset -4px -4px 12px #1a1a1a;
}

.button-overlay {
    margin-top: 50px;
}