How to get a button to expand and contract category

Is it possible to install a button on the side of my category's header, which will expand and contract it? Like the one in the screenshot. 

see here
http://help.forumotion.com/t102749-category-toggle-all-forums

Thanks for your help but it didn't work for me actually, I clicked "solved" too soon  

What exactly is not working?

Well the button doesn't appear at all so basically nothing worked. And also on the CSS Code provided in the tutorial, it had a lot of unnecessary hyphens and plus signs so I didn't know which one to keep or delete so perhaps that's the cause of my problem.

@HelloItsMe
Yes, I noticed that when posting the new code a character was removed, but I've corrected!
Please redo the steps of the tutorial and let us know if it worked ok?

About CSS, there is nothing unnecessary, but if you need to edit it and have trouble with this, we will be happy to help you!

Thanks,

JS

Thanks it worked! When I copied the code on the style sheet it was all red and that didn't look right to me, so that's why I thought it was a problem.

You are welcome!

Topic solved and archived

JS