css issue with banner element

Hi everybody,
I've been learning html/css for three month now and I'm creating my first website at the moment (pure css, no js). Now I've run into a pretty strange problem and got totally stuck. It would be so great if someone would be able to find a solution for this issue.

I've created a banner block for the top of my pages, the usual stuff you see everywhere - icon left-aligned, logo text and hamburger navigation menu right-aligned. Then, to make positioning and styling easier I...

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