Why is the javascript not working

Question

I am confused that why my javascript in the code is not working
No error is being shown when it is run.
Also I added CSS but only CSS of working and javascript isn't.
https://code.sololearn.com/WB0MGZMtCXIh/?ref=app

Answer 1

Shovon Das Actually I bymistakely had added "=" sign in document.write

Answer 2

Missing " ; " in line 1

Answer 3

Shovon Das still not working