u/GreenShell2014

Hi. We have been given an allotment. We have a newish shed but it seems to have been built incorrectly as there's gaps between the base and the side panels on all sides. What would be the best way to fix/address this? Looking for easy methods as we don't have the tools other than the basics (hammer, nails). Don't mind spending a bit to get it fixed. Have shops like Toolstation, Screwfix, B&Q etc nearby. Ideally don't wanna use expanding foam to make it look tacky. Many thanks!

Pictures attached. It's hard to see clearly. But there's a clear gap between base and the sides and we're worried about 🌧️ and 🐁