How do I stop richfaces adding borders to panels and calendars?

Question

I'm hoping to use a custom richfaces skin to handle the bulk of my presentation work. Unfortunately richfaces renders borders around every cell in a calendar component and around each panel. I would like to turn them off so that day numbers site in an open grid with no borders. There is no obvious way to do that using skins or attributes of the calendar control.

I could use custom CSS but I'd prefer to work with the framework to completely remove the border related properties from the stylesheets created by richfaces rather than work against the framework and override everything using ugly CSS.

So how do I stop richfaces adding borders to panels and calendars?

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