minor color and size tweak

[kiley-mitti]

Brief Description

noticed a tiny color change needed to be made to mobile-nav header and properly centered home page footer social icons.

JIRA Link

Related Issue

General Notes

Motivation and Context

Sometimes letting the perfect be the enemy of the good.

Issues and Limitations

Types of changes

• [X] Bug fix
• [ ] New feature
• [ ] Breaking change

Checklist

• [ ] This PR adds or removes a Storybook story.
• [ ] I have added tests to cover my changes.
• [ ] Regressions are passing and/or failures are documented
• [x] Changes have been checked in evergreen browsers

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