Fix video sizing on mobile landscape

[timmydoza]

Contributing to Twilio

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• I acknowledge that all my contributions will be made under the project's license.

Pull Request Details

JIRA link(s):

• AHOYAPPS-908

Description

This PR adjusts some CSS so that participant thumbnails are visible on mobile devices in landscape orientation:

Previously, the main video would expand vertically, pushing the thumbnails out of view. That no longer happens.

Burndown

Before review

• Updated CHANGELOG.md if necessary
• Added unit tests if necessary
• Updated affected documentation
• Verified locally with npm test
• Manually sanity tested running locally
• Included screenshot as PR comment (if needed)
• Ready for review

Before merge

• Got one or more +1s
• Re-tested if necessary