body {
    background-color: #f8f9fa;
}

.card {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
    border: none;
}

.display-value {
    font-weight: 500;
    color: #0d6efd;
    font-size: 1.5rem;
}

.display-4.display-value {
    font-size: 2rem;
}

.navbar-brand svg {
    vertical-align: text-bottom;
}

.table td {
    vertical-align: middle;
}

.time-btn.active {
    font-weight: 600;
}