post hero bug

when there is a long title, the PostHero can miss the top of the text.
I think we should have a minimum height for the hero, and maybe a minimum margin above the text to cater for the menu.

<img width="1299" alt="Image" src="https://github.com/user-attachments/assets/b57768bd-6533-42e9-aeb6-e5e7ca649dbd" />