Where to Change Category Toggle Button

I'm using Invision, and I would like to know where I can change the category toggle button. It's the button that minimizes and maximizes categories. I've scoured all over the administration panel, but I can't find it anywhere. I was hoping someone here would be able to help me out. Do I have to change it in the CSS stylesheet?

Please p[ost your forum's link.

Here's the link: http://infinityera.forumotion.com/

See if you can locate this image link in your CSS:

https://2img.net/h/oi25.tinypic.com/2cmk74i.jpg

Yes, I found it. I'm assuming I need to replace it with a link to a button of my own.

Yes.

I am having trouble locating the expand button image.

I think I found the "Expand Button" image. It appears as this in my CSS:

Code:

div.maintitle .expand {
background: url('http://i31.tinypic.com/2ihqn2t.jpg') no-repeat 50% 50%;
}

Would that be the correct one?

That is correct.

All righty then. I'll post back here when I'm done changing them and I'll let you know how it goes.

The topic will stay open until you reply back.

Thanks a lot for your help, slg. It worked out in the end.

Problem solved.