Styling Collection with Siblings

[david-f]

I have been able to create a form for a Collection containing a Sibling. It has a Delete button and an Add button annotated with the add_label. However, the Delete and Add buttons appear to have no styling associated with them and I want to give them the same style as the main Submit button, where would I put this styling information?
Thanks in advance,
David

[YLITC]

The documentation mentions this at 14.3. Rendering Collections. You can add a default_renderer to a collection.