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.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e482b4-44c7f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e482b4-44c7f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?