Can anyone fix my error in js

Question

https://code.sololearn.com/WJ45IVoNWaXg/?ref=app

Answer 1

https://code.sololearn.com/WJLRhKh9eSm0/?ref=app

Answer 2

Check the id name again , it's "mydiv" or "myDIV"

Answer 3

Open the demo webpage JavaScript error reported in the Console tool in a new window or tab.
Right-click anywhere in the webpage and then select Inspect. Or, press F12 . ...
Click the Open Console to view errors button on the top right. ...
Click the error.