pepper grinder refill funnel

For a long time, refilling pepper in my electric grinder irritated me. All the funnels I could find were either too small or too large, so the peppercorns kept spilling everywhere. I decided to make my own simple funnel that fits most grinders, since many of them are sold under different brands but use the same design. Now, when I refill it, the pepper doesn’t spill out to the sides.