Hello. I am relatively new and am looking for a black backdrop with no designs. Thank you.

Hello, welcome to Subeta! My first thought is the but it looks like you might already have that on, so I'm sure you're aware of if. Other than that, I don't know that we actually have a full black background with no texture - and hopefully, if I'm wrong, someone will come along and correct me. You may be better off layering items to just get as dark as possible, especially if you're going for something like your current avatar has with the darkness past the trees, where you aren't seeing the full backdrop. Here are some items to hopefully help you out!

To get the blackest, most featureless background I would combine these three items: by Lypsyl

would help with layering too!