My event listener button setColor is not work. I want to se color to id page next div. Thanks you sir.

Question

button event listener and id page.
https://code.sololearn.com/W2C6Ahv48sAg/?ref=app

Answer 1

Your el is querySelector(), so you don't need el[0]

Your input is querySelectorAll(), so it is a NodeList, so you should use input[0]

https://code.sololearn.com/W5iCWPM5L2cy/?ref=app