#stock-industry-heatmap-container {
    background: #fff;
    padding: 20px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin: 20px 0;
}

#stock-industry-heatmap-container .echarts-tooltip {
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 10px;
    border-radius: 4px;
    font-size: 14px;
    line-height: 1.4;
}

#stock-industry-heatmap-container .echarts-tooltip-title {
    font-weight: bold;
    margin-bottom: 5px;
}

#stock-industry-heatmap-container .echarts-tooltip-content {
    margin: 0;
    padding: 0;
    list-style: none;
}

#stock-industry-heatmap-container .echarts-tooltip-content li {
    margin: 3px 0;
}