silverwind 4539a7b0b4
Fix sticky diff header background (#27697)
Fixes: https://github.com/go-gitea/gitea/issues/27604

Add negative margins so the header covers any shadow of active elements.
No rendering change of the content of the header because the padding
counteracts the effect.

<img width="128" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/3d0f55b6-9351-4985-a290-da9a92d15b4e">
2023-10-20 14:56:19 +00:00
..
2023-10-18 15:16:06 +00:00