I think it's better if the primary actions have primary color instead of green which fits better into the overall single-color UI design. This PR currently replaces every green button with primary: <img width="141" alt="Screenshot 2023-09-16 at 14 07 59" src="https://github.com/go-gitea/gitea/assets/115237/843c1e50-4fb2-4ec6-84ba-0efb9472dcbe"> <img width="161" alt="Screenshot 2023-09-16 at 14 07 51" src="https://github.com/go-gitea/gitea/assets/115237/9442195a-a3b2-4a42-b262-8377d6f5c0d1"> Modal actions now use uncolored/primary instead of previous green/red colors. I also removed the box-shadow on all basic buttons: <img width="259" alt="Screenshot 2023-09-16 at 14 16 39" src="https://github.com/go-gitea/gitea/assets/115237/5beea529-127a-44b0-8d4c-afa7b034a490"> <img width="261" alt="Screenshot 2023-09-16 at 14 17 42" src="https://github.com/go-gitea/gitea/assets/115237/4757f7b2-4d46-49bc-a797-38bb28437b88"> The change currently includes the "Merge PR" button, for which we might want to make an exception to match the icon color there: <img width="442" alt="Screenshot 2023-09-16 at 14 33 53" src="https://github.com/go-gitea/gitea/assets/115237/993ac1a5-c94d-4895-b76c-0d872181a70b">
