Landing Page Using Flexbox And Grid

Unfortunately i used "position" for the main container of all content to center it to avoid using padding for the same thing, that made things difficult and i figured it out at the end of the project and modifying it would cost me a lot of time to refactor the whole project, so anyway i realized my mistake.

but the thing i need suggestions about to enhance the code is the "Track Section". you will find every section organized and commented in both HTML and CSS, so please take a look and tell me how to make it better.