@tuanphan
still a gap, i'm afraid. i appreciate your efforts!!
i suspect it has something to do with this command:
It does look like 20px of padding is going both between and beneath the grid. Your code is overruling the top padding, but not the bottom unfortunately. Or, alternatively, it is the generic 17px of padding that you mentioned above comes with every block.
What do you suggest?
Thank you once again for your efforts.
Jonathan