Code

Question

Have a trouble, whats wrong with this code?
https://code.sololearn.com/WBWosxKe4u3G/?ref=app

Answer 1

Try this

window.onload = function(){
var m = document.getElementsByClassName("ok");
var cl = "#444"
m[0].style.backgroundColor = cl;
}

Answer 2

Actually Javascript is loading before body in your code. That's why you getting error.

Answer 3

@Ranjan yeah, sorry, thanx, it really works, idk why but when i tried it didnt work😞

Answer 4

You maybe have to wait for the body to be loaded.

Answer 5

Ranjan's answer works for me