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The customized (or standard gallery) theme you created in ThemeRoller, downloaded, and referenced in your project is a partial match to your target design but doesn’t match exactly. You need to modify the styles, but at the same time you want to ensure that edits to these styles don’t make it difficult for you to upgrade to newer versions of jQuery UI scripts and CSS.
Create custom override styles, scoped to the components that need additional non-ThemeRoller styling, and structure them so that they don’t conflict with or overwrite any standard jQuery UI CSS files.