.pnv-countdown {
    display: block;
    margin-top: .5em;
    font-size: .875em;
    font-weight: bold;
}
.pnv-countdown.valid { color: #28a745; }
.pnv-countdown.invalid { color: #dc3545; }
#place_order:disabled { cursor: not-allowed; opacity: 0.5; }