Disable color-scheme on iframe

[androidacy-user]

When an iframe has transparency, having a dark color-scheme value causes it to render with a white background. This causes text to be invisible if the iframe is respecting dark mode and adapting to it.

One very easy to check example is disqus.

Description

Motivation & Context

Type of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Refactoring (non-breaking change)
• [ ] Breaking change (fix or feature that would change existing functionality)

Checklist

• [x] I have read the contributing guidelines
• [x] My code follows the code style of the project (using npm run lint)
• [ ] My change introduces changes to the documentation
• [ ] I have updated the documentation accordingly
• [ ] I have added tests to cover my changes
• [ ] All new and existing tests passed

Live previews

• https://deploy-preview-{your_pr_number}--twbs-bootstrap.netlify.app/

Related issues

[mdo]

Have a demo?