TableView in UIView - as cell size and shadow value

I added a table view to a uiview in Storyboard and I am having problems getting the cell to be the correct size. It is unusually large currently as I am trying to resize the table to fit the uiview. Can anyone tell me how to resize the cell (the top handle is not shown and the dimensions are off in the sizing inspector) and also why it has a series in white in the middle ... What is white relative to gray