Acuity Scheduling CSS limitations or none?

Hello - looking for some advice.  Prior to jumping in and committing to acute to handle our classes and events ticket sales etc, I was just wondering how much control over layout I can get with the advanced CSS on the Powerhouse plan ... can I do pretty much what I want, or is it restricted to certain elements or classes ?  I would be trying to convert the layout from the table setup to a more appropriate for our situation flex box type arrangement to get a better flow of the classes.  A bit like a masonry or building blocks type layout.    Can the advanced CSS allow me to do that?

Thanks! 

You can share link & describe desired layout, we can help easier.

If you are good at CSS, you can customize a lot of things, of course there are still some limitations, and need Script code