Dont find the Error | Color an Button

Question

Ive got issues with my Script... . Can someone please look over it? ... It should color the Submit button to green/red at right/wrong input.

https://code.sololearn.com/Wtioz90b2U8h/#

Answer 1

JS line 1,2,3 should be wrapped in an onload function.

window.onload = function () {
//line1
//line2
//line3
}

to avoid getElementById executing before DOM loads.

Line 24 getElementById has wrong ID. Instead of 'output', it should be 'Output'.

Answer 2

Thank You c: