[Bug]: Unexpected vertical line appears in the tab area after installing Atom Material UI

[Sakura0122]

Describe the bug

Description

After installing and enabling Atom Material UI, an unexpected vertical line appears in the editor tab area.

The line appears between the tabs and the empty space area, as shown in the screenshot.

This seems like a UI rendering issue because the line does not belong to any UI component and affects the visual appearance of the editor.

To Reproduce

Steps to reproduce

1. Install Atom Material UI plugin
2. Enable Atom Material UI theme
3. Open editor tabs
4. Observe the area between the tabs and the right empty space

Expected behavior

Expected behavior

The tab area should render normally without any extra separator line.

Actual behavior

A vertical line appears unexpectedly in the tab area.

Material Theme Version

v11.1.0

IDE

PyCharm

System Info

- Atom Material UI version: 11.1.0
- IDE theme: Atom Material UI theme GitHub Dark (Material)

Logs/Screenshots