Board Thread:Support Requests - Getting Technical/@comment-26368573-20121230071420/@comment-4139585-20121230124235

You need to add the  property to the same element that has the border, for example:

You should also include the  property with the same value so that users can see the rounded edges with Firefox.

As for size, I have no idea how to change the size (I'm assuming you would need JavaScript), but if you want to be able to collapse the box, you should add the  class to the same element. If you want it to be collapsed by default, you should also add the  class as well.