[WEB-3326] Fixed White Background issue in Web Popup

[singhkunal2050]

Changes

WEB-3326 The customer website (viu.com) which was having web popup with white background instead of a transparent overlay.

After investigation we found it was due to the color-scheme:dark property on the top document. As a fix we have reset the color-scheme property in the web-popup iframe which fixes the issue

Refer Screenshot

Changes to Public Facing API if any

No Changes

How Has This Been Tested?

• Tested the Web Popup on the client website by overriding the style of the iframe as shown in the screenshot
• Toggled the system theme to dark and light to verify it across color themes

Checklist

• Code compiles without errors
• Version Bump added to package.json & CHANGELOG.md
• All tests pass
• Build process is successful
• Documentation has been updated (if needed)