Modern Bootstrap CSS HTML Document

I'm looking for a freelancer who can create an offline HTML document using Bootstrap CSS. The document should have a modern-styled top nav bar that allows for the loading of various subpages at the bottom of the window upon clicking a menu item.

Key Requirements:
- A modern design for the navbar
- Subpages: Services, Portfolio, Testimonials
- Incorporation of an image gallery within the subpages

Ideal Skills:
- Proficient in Bootstrap CSS
- HTML expertise
- Experience in creating modern UI/UX designs
- Knowledge of implementing image galleries in HTML documents

Please note, this project does not require any server-side coding or online functionalities. The document should work completely offline.