<html> <head> <link rel="stylesheet" type="text/css" href="../css/c3.css"> </head> <body> <div id="chart"></div> <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script> <script src="../js/c3.js"></script> <script> var chart = c3.generate({ data: { columns: [ ['data1'], ['data2'], ], }, axis: { y: { default: [-100, 100] } } }); </script> </body> </html>