It is difficult to determine which pane is currently focused

**Describe the bug**

The title says it all.

**Screenshots**
<img width="1503" alt="Screenshot 2024-11-30 at 22 57 22" src="https://github.com/user-attachments/assets/c5a3ef4b-a721-4616-9c8b-592a83ac2f24">


**Environment**
 - OS: macOS
 - Terminal: iTerm2, WezTerm
 - `so --version`: 0.4.10