White border appearing around drop down menus on Linux

[Brave-Matt]

Description

After the update to version 1.67.115 on Linux, there is a white border that appears around/behind browser drop down menus, such as the main menu or bookmark folders, etc.

Steps to reproduce

1. Launch Brave while using Linux/Kubuntu/i3
2. Click hamburger menu or bookmarks bar folder
3. Resulting drop-down menu has a white border around the shadow gradient

Actual result

White border/background appears

Expected result

Should be no boarder/background behind drop down menus

Reproduces how often

Easily reproduced

Brave version (brave://version info)

v1.67.115

Channel information

• [X] release (stable)
• [X] beta
• [ ] nightly

Reproducibility

• [ ] with Brave Shields disabled
• [ ] with Brave Rewards disabled
• [ ] in the latest version of Chrome

Miscellaneous information

Original user report: https://community.brave.com/t/white-border-around-dropdown-menus-navigation-menu/553579