Multiplayer Center Banner titles are not light-theme friendly and there is a gray panel overlapping with the Unity logo

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Make sure the Editor is set to Light Theme
3. Open the Multiplayer Center window (Window > Multiplayer > Multiplayer Center)
4. Observe the banned in the Multiplayer Center window

Actual results: The title is hard to see, and there is a gray panel overlapping the Unity logo

Expected results: The title is light-theme friendly and there are no elements overlapping the Unity logo

Reproducible with versions: 2.0.0(6000.6.0a4)

Tested on (OS): MacOS Silicon Tahoe 26.3