Change Background Colour Help

[Dr Octogonapus]

Hello in need of a bit of help. My graphic logo I am trying to change the background from black to this hex colour.
#363839

Here is the logo,

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Thank you so much to whoever can help me. It's just not letting me change the background.

 

[loj]

Like this?

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[Dr Octogonapus]

Thanks mate that looks fantastic. +rep for you.