All the widths and the heights have to add up. When you determine the size of your display, all the heights, widths, margins, padding, and borders have to add up.
I tried to move the left edge inward by 20px by adding 20px to each left, but it did not work. A 20px band showed up on the left side.
Refer to 085A_TS_Positioning.html for notes and definitions of locations.