Mobile first using css media queries, js and animation

Hello everyone,

The resolution of this project reminded me of things I took for granted. Nowadays, with all these framworks we can quickly think that everything is mastered.

All feedback are welcome, especially on :

1. the animation for the side menu on the mobile version and also the drop down menu.
2. How did I handle the max-width property for my elements.

And finally, for me the main background color was not clear so I put what I found to be right.

Thank you all