Why is there 'style' property not working in js?

Question

https://code.sololearn.com/WQCvNRX7rJ3c/?ref=app

Answer 1

This is because the javascript is loaded before the html. One way to avoid this is to use the onload event:
onload = () => { Your javascript }

Answer 2

Share a link to the non working code in the Description, and please add CSS in the tags ☝

https://www.sololearn.com/post/75089/?ref=app

Answer 3

Huzaifa,
Please read the following post, it explains why this problem occurs, and provides also the workaround.

https://www.sololearn.com/post/90825/?ref=app