All solutions

I' m happy with the result, but, as always, the spacing and the layout required substantial trial and error. I'd like to get better at that but really don't know how.

The CSS file is quite disorganized also, with 0 use of utility classes and variables. That would probably be the next thing to work on.

I got in trouble getting the sizing of the nested grids right (specially the testimonials section). Any help would be greatly appreciated!

I'm not sure what's the flow of the UI. When should we calculate the tip?