[value] [top, right, bottom, and left] 10px
[value] [value] [top and bottom] [left and right] 10px 20px
[value] [value] [value] [top] [right and left] [bottom] 10px 20px 30px
[value] [value] [value] [value] [top] [right] [bottom] [left] 10px 20px 30px 40px
