Injecting styles - check if style already exists? Or clear/remove existing page styles?

Hi Cuba Support,

I am injecting css styles into CalendarEvents to style the events how we would like.

Page.Styles styles = Page.getCurrent().getStyles();
 styles.add(String.format(
                ".%s { background-color: %s!important; color:%s!important; border: %s 2px solid!important;}",
                styleName, backgroundColor, fontColor, borderColor));

This works fine except the same styles get injected multiple times - is there any way around this?

Can styles be checked before being added or can they be cleared/removed in some way?

Any help is appreciated.

Kind Regards

Matt