HTML Enclosure Stack

Hi!
Please suggest how to using this stack to do the picture rounded edges? Tried different ways, nothing happens, often all the fields in the stack just closed and there is no opportunity to edit. It turns out only to change the picture size and centering on the page.

What’s wrong?

[code]


picture
[/code]

This isn’t a stack, it’s CSS.
Try putting this code in RW’s general settings tab for CSS.