Polaroid Phone Case

Based on Polaroid Phone Case by Cat Morley
Well, I didn't have any black felt so I used purple, but I like it. All the materials are from my Nan's attic :3 I've gotten a compliment on it since I made it a few hours ago so I'm happy :D However, when you look at the original it's seems pretty perfect, but I'd add some seam allowance to the beige panels because my iPhone just peeps out of the end after it's sewn up (in the original it tells you to just trace the iPhone right round). Did anyone else make this and have the same problem?