Responsive Landing Page Using HTML, CSS, and JS

What did I find difficult while building the project? Styling the curved edges proved to be difficult. I don't want to position it for it may give me issues wit responsiveness. I was looking for a way I can style it once and for all without having to change each section with each media queries. After much googling(which is a developer skill anyway), i got the idea touse the background differenntly. I dont need to use positioning and it works just fine. Do I have any questions about best practices? I can only hope I've done my best with best practices. I always have accessibilty isuues. God abeg.