如何在Chart Js中自定义工具提示？

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
        datasets: [{
            label: 'My First dataset',
            backgroundColor: 'rgb(255, 99, 132)',
            borderColor: 'rgb(255, 99, 132)',
            data: [0, 10, 5, 2, 20, 30, 45]
        }]
    },
    options: {
        tooltips: {
            enabled: true,
            mode: 'single',
            callbacks: {
                title: function(tooltipItems, data) {
                    return data.labels[tooltipItems[0].index] + ' Month';
                },
                label: function(tooltipItem, data) {
                    return 'Value: ' + tooltipItem.yLabel;
                }
            }
        }
    }
});

<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-tooltips-updated"></script>
<script>
    var ctx = document.getElementById('myChart').getContext('2d');
    var myChart = new Chart(ctx, {
        type: 'line',
        data: {
            labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
            datasets: [{
                label: 'My First dataset',
                backgroundColor: 'rgb(255, 99, 132)',
                borderColor: 'rgb(255, 99, 132)',
                data: [0, 10, 5, 2, 20, 30, 45]
            }]
        },
        options: {
            plugins: {
                tooltip: {
                    enabled: true,
                    mode: 'single',
                    callbacks: {
                        title: function(tooltipItems, data) {
                            return data.labels[tooltipItems[0].index] + ' Month';
                        },
                        label: function(tooltipItem, data) {
                            return 'Value: ' + tooltipItem.yLabel;
                        }
                    }
                }
            }
        }
    });
</script>

options: {
    tooltips: {
        enabled: true,
        // 其他配置
    }
}

/* 示例CSS */
.chartjs-tooltip {
    background-color: #333;
    color: #fff;
}