JS | HTML how do you ... do this...

Question

I don’t know what to title it. I’m gonna explain it though.

Let’s say I have 10 elements.
Class = “b”;
I want the width to += 10 + “px”;
It doesn’t have to be 10 but just for example.

So the 1st element would be width 10px
2nd element width 20px
3rd element width 30px ...

https://code.sololearn.com/WCU1quD6V3Fe/?ref=app

Answer 1

x[i].style.width = (i+1)*80 + "px"

Answer 2

https://sass-lang.com/documentation/at-rules/mixin