That would never be a mess like the router in Ionic 3 (they abandoned it in Ionic 4 a the bugs will never be fixed, it's a nightmare on a daily basis, and migrating from 3 to 4 is a nightmare also)
I just started this tutorial. Thats is a "why", not a "how"... So maybe I can ask here. Why grid-column start include the value and grid column end exclude it... In fact where there is a ressource for understanding css logic on the internet?