When filtering blog posts by category, how can I make the filtered results clearer?

Hi, I recently added this header section (in light blue) to a blog page so that users can filter blog posts by category using the filters (which I have setup using an Archive block). When it brings up the filtered results the header remains the same and I'm keen to change the header somehow to show the category that's been selected. Is there a way to do this somehow please? 

I'd ideally like the selected category to change the dark blue background with white text (like the 'Filter by' text), but open to any other suggestions.

TIA! 

Yes use summary blocks in their own blog separated by category which is the title of the post. Like mine here: Blog posts by category/subject with menu