pfffff, waitingg for the backup...

Dit weekend dus met de boot van Zeewolde naar Amsterdam gevaren, we hebben geslapen in de gracht

I created following effect using border-radius combined with border-top-left

I created following effect using border-radius for the outer div (rows)
and the following for the first and last row

• border-top-left
• border-top-right 
• border-bottom-left 
• border-bottom-left

See the demo