Changing round corners to square corners on buttons

I just created a new forum i wanted to changed round corners on my send, search, etc. buttons to square.

This is what it looks like right now:

Spoiler:

This is what I want it to be:

Spoiler:

The search button is also like this. It makes it look really sloppy.

Thanks.

Did you have a code that does it?

I don't have a code, but I know there has to be one though...

AP > Display > Colors > CSS Stylesheet
find theese two codes, separately

Code:

input.liteoption
input.mainoption

The first one is for PREVIEW; Second one is for SEND
Delete the rounded corners code there.

For TEXTAREA, find this code:

Code:

input,textarea, select, #text_editor_iframe

or if it isn't that excatly, look for textarea editor or similar
And delete the border radius code there, too.

I hope it helps, if you have some problems, I would appreciate if you give me the link of your forum.