Updating footer colors

[jaegerfe]

Fixes #737

Description

Updating footer colors to keep consistency and creating a new variable for footer background.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have cleaned up the code in the areas my change touches
• My changes generate no new warnings
• I have checked my code and corrected any misspellings
• I have removed any unnecessary console messages
• I have tested for mobile functionality and responsiveness

[cloudflare-workers-and-pages]

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