A minimum of .125" or 1/8" should be left from all edges. While content can be included in the top portion where the hole and slit will be, it should be limited to the top corners and not placed around where the hole will be. These designs can look quite fetching, but only when the hole is exactly centred within the design. Due to the variable nature of the manufacturing process, we cannot guarantee that the hole will be in the same place every single time. Therefore, at least .125" or 1/8" of margin should be left around the hole, but 1/4" or .25" would be even better to really ensure things don't look lopsided.