Steps to reproduce:
1. Create new Unity project
2. Change Editor theme to Light (Preferences > General > Editor Theme)
3. Open Package Manager window
4. Install Behaviour package (com.unity.behavior)
5. In Project window create Blackboard (Create > Behaviour > Blackboard)
6. Open Blackboard window
7. Pressing “+” at the top right and select Enumeration > Create new enumeration type…
8. Observe the Delete icon on the right next to the “Member 1”

Actual results: Delete icons are hardly visible in Blackboard > New Enum Type window

Expected results: Delete icons should be visible in Blackboard > New Enum Type window and should adapt accordingly to Editor theme

Reproducible with versions: 1.0.13 (6000.0.62f1, 6000.2.10f1, 6000.3.0b9, 6000.4.0a4)

Tested on (OS): Ubuntu 22.04, macOS Silicon Tahoe 26.0 (M1)