are you talking about a plugin? https://marketplace.atlassian.com/plugins/ch.bitvoodoo.confluence.plugins.navitabs
You can change existing colours and formatting by over-riding the CSS from the plugin using the Custom HTML function.
David Simpson has already got a good answer here: https://answers.atlassian.com/questions/21912/how-do-i-override-css-styles-in-the-documentation-theme
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Any other country that celebrates Midsummer holiday (this friday 22 June)?
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