header menu

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Hi,

While making a custom theme I am running into a problem.
when adding the auto-nav block it is possible to select a custom theme.
Breadcrumbs or header menu.

I like header menu and I have used it before within a template but on my own, newly created theme (which is almost empty) there seems to be no CSS-formatting for header menu despite the fact that I was able to select it via the concrete5 options.

Any tips on how to solve this?

Crucidal