The "Feedback..." interface on servers doesn't have an inner background, unlike other interfaces

The Bug:

The "Feedback..." interface on servers doesn't have an inner background, unlike other interfaces.

Steps to Reproduce:

1. Start a server and navigate to the "server.properties" file.
2. Change the value of "bug-report-link" to the text provided below.

   https://bugs.mojang.com

3. Launch the server and load into it.
4. Click on the "Feedback..." button and observe the interface's background.

Observed Behavior:

The "Feedback..." interface doesn't have an inner background.

Expected Behavior:

The "Feedback..." interface would have an inner background.