This demo shows a few techniques of using media queries in css to change the layout of your pages when viewed on mobile-sized screens vs desktop-sized screens. It uses a "desktop first" approach.
code: https://replit.com/@alannarisse1/oyat...
The hamburger menu mentioned in this video:
code: https://github.com/alannarisse/psuint...
View it in action: https://psuinteractivemedia.com/code_...