Simple PDF Validation Webpage

I need to design a simple webpage for file format validation, similar to an existing page I have.

Requirements:
- The page should be identical to my current design.
- Primary purpose: A file checking page.
- Functionality: Validate that uploaded files are in PDF format.

Ideal Skills and Experience:
- Web design experience.
- Familiarity with file validation processes.
- Ability to replicate existing webpage designs.

Please provide examples of previous work and ensure the design is clean and user-friendly.