.btn-black {
    display: block;
    text-align: center;
    padding: 20px;
    width: 50%;
    background: #222222;
    margin: 18px auto;
    color: #fff !important;
    font-weight: 500;
    text-decoration: none;
    font-size: 20px;
    font-family: 'Poppins';
    transition: background 0.3s;
}

.btn-black:hover {
  background: var(--color-primary-site);
}