ead>
    <body>
        <style>
            body {
                background: #eee;
                margin: 0;
                text-align: center;
            }
            #main {
                box-sizing: border-box;
                margin: 0 auto;
                width: 800px;
                max-width: 100%;
                text-align: center;
            }
            .chart {
                height: 400px;
                border-radius: 5px;
                margin: 20px 0;
                box-shado