Fixed background color of navbar.

[LegendCK]

Description

Navbar color is bit darker than it's background when we increase the brightness of screen.

Before -

After -

Related Issue

Fixes #184

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented on my code, particularly in hard-to-understand areas
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes
• [X] Any dependent changes have been merged and published in downstream modules

[vercel[bot]]

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[TenzDelek]

lgtm