I don't really know how to describe this, but I'm trying to do something like this:


See how the page and the header overlap?

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jghwebbrand Premium
This looks like a theme design layout.
AbieAJ Premium Plus

It could be theme limitations.

I was unable to detect a WordPress application.

If perhaps you can give us more info so that we are able to help your further.
ClassyCrip Premium Plus
I'm using GeneratePress. I already created a custom header using the header section in GeneratePress elements. I do know that it's possible with the theme, but I'm not sure how.