Work on browser warnings

[epugh]

Description

remove unused css

Motivation and Context

firefox warns on unneeded css

How Has This Been Tested?

manually

Screenshots or GIFs (if appropriate):

Types of changes

• [] Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves existing functionality)
• [] New feature (non-breaking change which adds new functionality)
• [] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [] My code follows the code style of this project.
• [] My change requires a change to the documentation.
• [] I have updated the documentation accordingly.
• [] I have read the CONTRIBUTING document.
• [] I have added tests to cover my changes.
• [] All new and existing tests passed.

[epugh]

So, turns out one of our gems may be part of the issue! MiniProfiler/rack-mini-profiler#504. Going to do a PR!