Adapt our current 11 web pages correctly to implement/adapt completely semantic markup HTML5, CSS and responsive

Adapt our current 11 web pages correctly to implement/adapt completely semantic markup HTML5 including the h1 tags etc and [login to view URL] Including personalized [login to view URL] To adapt the current CSS for responsive web styling/design for EVERY DEVICE including desktop, laptops, web, IOS (including ipads), androids. Parts of Bootstrap5 or eventually Foundation 6 can be used. For small screens (IOS & androids), it is required to open a menu by clicking the top menu sign (drop-down menu) in the left corner. Needs to work with all type browsers but not limited to Firefox, Opera, Edge, Chrome, Safari and eventually IE 11. ** Enclosed our current source code including the 11 pages ** . - Layout/colors may NOT be changed except for the sitemap.html. - Only the button "contact us" can be replaced through a CSS code with the text "Contact Us" if needed. Please reply with examples of your work, you should have experience with CSS and HTML5 Semantic , Bootstrap, Foundation 6. Skills Required: Website Design, HTML5 Semantic, JavaScript, CSS, Responsive web styling/design, Bootstrap and/or Foundation 6. Don't waiste time - only serious bids ! Regards