it's first time to me install blender on my device macbook pro. i think ui blender for osx have some a bug. there is a half shadow on each button, i dont know it just happened on my device or every osx.
i added the ui image for more detail what happens when i open the blender

System Information
Operating system: Darwin-18.6.0-x86_64-i386-64bit 64 Bits
Graphics card: Intel HD Graphics 3000 OpenGL Engine Intel Inc. 3.3 INTEL-10.4.14

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: rB0f45cab862b8
Worked: (newest version of Blender that worked as expected)

Short description of error
[Please fill out a short description of the error here]

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]