One problem about Chart.js

When I want to use Chart.js to draw one pie chart,But This chart is very big,When I use

  <canvas id="myChart" width="400" height="200" ></canvas>

It is not working. And I am very confused.Anyone encounter this problem before?Please help me.Thank you!

Mar.06,2021

I try to add div include canvas,It can do this.

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