What happened here? It used to be blue.
The primary colour has changed network wide it appears. The Ask a question button is orange on a selected site I just randomly tested, as was also pointed out by Animuson in the comments.
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We’ve got a new theming API in Stacks that was leaking a bit. Funnily enough, all the themes we happened to test via smoke tests already had orange buttons so we didn't catch it.
And before everyone shouts about visual regression testing, yeah. I agree. We're working on that too 😛