body {
    background-color: #f8f9fa;
}

.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.list-group {
    max-height: 300px;
    overflow-y: auto;
}

.list-group-item {
    padding: 0.5rem 1rem;
}

#frequencyChart {
    width: 100%;
    min-height: 500px;
    height: calc(100vh - 400px);
}

.frequency-item {
    display: flex;
    justify-content: space-between;
    padding: 5px 0;
    border-bottom: 1px solid #eee;
}

.btn-group .btn.active {
    background-color: #0d6efd;
    color: white;
}