Opera: how to change the font and color of posts on Reddit?

Question

Opera

This creepy gray soapy text is simply unreadable. I agree to the black arial, but how to bubble it there?
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UPD Thanks hzzzzl ; look how beautiful it turned out and do the same for yourself:

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Answer 1

https://chrome.google.com/webstore/detail/styler-c...
(Chrome extensions can be added to Opera)