-
Nice and clean layout. it meets the requirements as you mentioned, the green button and the 3 arrow are prominent.
The things that draw attention and don't seem to be well placed/designed is the green button and the header/footer.
- Many things on the layout do not feel properly placed on a grid.
- The header and footer don't feel balanced.

You totally right with the grid. I´m learning so many things - cool concept :)
Thanks - Heidi