Insure Landing Page using HTML and CSS

I really learnt a lot working on this project and also had fun, it opened my eyes to some things e.g The Navigation Menu, which i worked on for the very first time, i added some animation to it and it turned out nice. Spare a second to check it out, i will appreciate. I got some accessibility and HTML issues and i don't know how to go about it, would appreciate if you could put me through.