Make footer image full width

[ericsanner]

Description / Motivation

https://trello.com/c/xDFHJWvS

Add a width tag so the footer image is full screen width (override the max-width property which caused the background to show through).

How Has This Been Tested?

Tested by using the browser to zoom in and out to various sizes.

Types of changes

• 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 change)

Checklist:

• I have read the Contributing guide.
• My code/comments/docs fully adhere to the Code of Conduct.
• My change is a code change.
• My change is a documentation change and there are NO other updates required.