[WCAG] Optimize for consistent styles and layout

[kenchase]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

• Styles aren't consistent between content output types (markdown vs
• CSS implementation could be optimized (use theme values rather than hard-coded values)
• All CSS should be placed in the about-panel-style file

Expected Behavior

No response

Steps To Reproduce

No response

Anything else?

No response