.vpta-pay {
    background: #dc3545 !important; /* red */
    color: #ffffff !important;
    border-radius: 8px;
}

.vpta-paid {
    background: #28a745 !important; /* green */
    color: #ffffff !important;
    border-radius: 8px;
    cursor: not-allowed; /* or auto */
    opacity: 0.9;
}