.input-group-custom {
            margin-bottom: 1rem;
        }
        .histogram-canvas {
            width: 100%;
            height: auto;
            background-color: #f9f9f9;
            border: 1px solid #ddd;
            border-radius: 8px;
            margin-top: 1rem;
            display: block;
        }
        .canvas-container {
            text-align: center;
            margin-top: 1rem;
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin: 0.5rem 0;
            font-size: 0.9rem;
        }
        .legend-item {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .legend-color {
            width: 16px;
            height: 16px;
            background-color: #2c7fb8;
            border-radius: 2px;
        }
        .frequency-table {
            max-height: 320px;
            overflow-y: auto;
            font-size: 0.9rem;
        }
        .slider-label {
            display: inline-block;
            width: 50px;
        }