fix(select): set positioner background to prevent overscroll bleed

[Shreyag02]

Description

The positioner element was transparent, so during touch-overscroll bounce the page's background (or whatever sits behind the popover) showed through the dropdown's edges. It was highly visible in the dark-theme, multiselect example.
Setting it to --rs-color-background-base-primary make the layer opaque so overscroll bouncing no longer reveals what's behind.

Type of Change

• Bug fix (non-breaking change that fixes an issue)

How Has This Been Tested?

visually tested.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (.mdx files)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

Screenshots (if appropriate):

N/A

Related Issues

#736

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
apsara	Ready	Preview, Comment	May 8, 2026 8:01am

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 22a11a5f-2464-443a-942b-bec87a9963dc

📥 Commits

Reviewing files that changed from the base of the PR and between f8b9b8c and 9dd0aae.

📒 Files selected for processing (1)

• packages/raystack/components/select/select.module.css

---

📝 Walkthrough

Walkthrough

This pull request adds a single CSS styling declaration to the Select component's stylesheet. The change introduces a background-color property set to the --rs-color-background-base-primary design token on the .positioner class. This is a styling-only modification that does not alter any component logic, interface, or behavior.

Suggested reviewers

• rohilsurana
• paanSinghCoder
• rsbh

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a background color to the positioner element to fix overscroll bleed visibility.
Description check	✅ Passed	The description clearly explains the issue (transparent positioner showing page background during overscroll) and the solution (setting background color), directly matching the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}