.add-to-cart-form {
    width: 100%;
    margin-bottom: -20px;
    text-align: center;
}

.add-to-cart-form .btn {
    font-size: 25px;
    letter-spacing: 1px;
    text-decoration: underline;
    text-transform: uppercase;
    color: #ffffff;
    font-weight: 400;
    min-width: 220px;
}