I'm glad someone is working on better CSS tutorials. The place I have the most trouble is getting content inside a flexbox to fill the box, especially when mak

I'm glad someone is working on better CSS tutorials. The place I have the most trouble is getting content inside a flexbox to fill the box, especially when making a single screen app where I want various "panes" and I want the content inside to fill those panes. For whatever reason I still haven't completely figured it out and it's always trial and error. Sometimes I need a "min-height: 0" and other times it seems like I need a "height: 100%;" and a maybe a "position: relative;" I wish (I should probably write this myself), I wish there was a way of specifying the areas and their constraints and then have that translated into the appropriate CSS.