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[exasko]

Alright I am wondering how or where I can change the look of the background to my post..

[Bad Bunny]

Well, you can do it through css, or the most probable way is by editing the postbit. If you are using Legacy postbit, you would edit that template.
Your question is a little vague, so I'm sorry if my answer seems a little vague.

Good luck, and happy sushi to you.