Change Digital Menu Covers Background

I need assistance in updating the background color of two PDF menu covers to a nice blue shade. The menus are in PDF format, and I would like to use a nice shade of blue for the background.

Key Requirements:
- Change the background color of two digital menu covers to blue
- Ensure the new background complements the existing design and text
- Maintain the quality and format of the PDF files

Ideal Skills and Experience:
- Proficiency in graphic design and PDF editing
- Experience with color adjustments and design aesthetics
- Attention to detail to ensure a professional finish

I'm looking forward to seeing your creative solutions for this simple yet important task!