.countdown-btn:disabled {
    opacity: 1;
}

.countdown-btn.btn-success {
    border: 0 !important;
}

.countdown-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: var(--bs-secondary);
    transition: width 1s linear;
    border-radius: var(--bs-border-radius);
    z-index: 2;
    pointer-events: none;
}