Tabs styles

[evgenoid]

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• [ ] Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[x] Code style update (formatting, local variables)
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Issue Number: GOOD-168

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[ ] Yes
[x] No

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[evgenoid]

@ghsteff what we decided with this one?

[ghsteff]

@ghsteff what we decided with this one?

So the tertiary tab variant looks pretty much the same as our button group which could be confusing if you use both of these in the same app. But this is a nice variant of tab to have pre-built 🤔

You know how we have some stories called CustomTheme? Maybe having this tertiary tab variant as a CustomTheme story would make the most sense because it's saying "This doesn't necessarily match our default theme, but it's one example of a way you could style this"

You think some designs would use all these tab variants in one app?