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hmm... haven't made "spoiler text" on my site before, but have you tried using the HTML FONT tag? If I remember right, that should override the CSS definitions. If that doesn't work, then try creating a new CSS ID in your theme's CSS file made just for spoilers and reference to it in your blocks/documents/theme/et cetera.
sorry... i'd test it out for ya, but the server that hosted my site burned down.... good luck w/ your site!
-zimmi88 =)
"Need coffee, keep away..."