Changing background color of jquery-ui button?

I'm using jquery-ui for buttons. The default theme looks great, but I'd like to apply a different background color to a few specific buttons. Is there a way I can easily add another css class to my buttons to just change the bg color of them, without changing any other properties of the开发者_开发百科 button?

Thanks

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Just add it to the button's HTML and when the button is created it will get all of the existing classes.