Styling editor textarea

[MoMan]

I'd like to get my editor textareas to look just like the do here on vB.org, instead of having that lame default edgy look.

I've tried to accomplish this using a CSS class, but that doesn't override the id given to it for JS functionality. Do anyone know where the styling for the id is defined, or how to otherwise style the textarea?

Also, what styling exactly is used here on vB.org? Is it just a 1px gray border with 2px radius rounded corners?

See the attached screenshot for my beautiful editor with an otherwise ugly textarea