Post css can be used in place of Part preset env within post css right but then use post css for any non-standard syntax. vendor prefixing it removes vendor prefixes that you don't need which is kind of interesting because sometimes You are importing some css from like a library And they will ship vendor prefixes. It also does custom media queries, which is something that I really like you to find it at custom hyphen media Then you give your media query a name. and that's a good point is that you can use the post css on top of this if you're looking for Like more configurability and stuff.