Final understanding of CSS + JS Transition

Question

I got a simple code here - for experiment. I've tried looking up transition CSS and JavaScript, but I never got the result I wanted.
So, on this code what I'm trying to do is to make the 'JavaScript learning' content width to 10. And that's all done with CSS + JavaScript for applying Onclick.

https://code.sololearn.com/WXBPQb7gjqdH/?ref=app

Function YourBrain(){
If (question make no sense)
{ please let me know};
else { you = understood question}}

Answer 1

ya