We need to move the subchart to the top using billboard.js

Can anyone find the solution of the problem that I want to move the chart to top then mainchart in browser.Please let us know how to resolve this

I want to move the subchart at the top then mainchart should display in browser.

var chart = bb.generate({
  data: {
    columns: [
    ["sample", 30, 200, 100, 400, 150, 250]
    ],
    type: "line", // for ESM specify as: line()
  },
  subchart: {
    show: true, // for ESM specify as: subchart()
    showHandle: true
  },
  bindto: "#subChart"
});