/diy/ - Do It Yourself

at the house i bought, the previous owner built a shed himself. it's not a terrible shed. no leaks inside when it rains, but the door does not seal well at all.
it's a bit like pic related, and i guess i should have just taken a picture of the actual shed but the problems in the picture are basically identical.
there aren't any gaps in the actual planks of the door. the door itself is like, two layers thick with alternating planks, if that makes sense. no gaps in the door itself.

however, there are gaps all around the outside of the door. like, between the door and the floor, as well as between the door and the frame.
little animals and snakes and shit get in through the cracks and i would rather there not be snakes in my shed anymore.
i don't really know the correct way to fix this. i was thinking of maybe putting like, foam or weather stripping around the frame so the door is flush with it as a seal.
or, maybe cutting some wood pieces and building a wooden "seal" on the frame so when the door is closed there are no gaps anywhere.
it doesn't have to be properly secure like a house door, i just want the big gaps closed up so shit stays out.