Any way to change the background color of the block editor viewer?

I use an extension in my browser to change the very light colors of a web to dark, so it doesn’t hurt my eyes, I’m sensitive to light tones. But it doesn’t work with the viewer block editor and night mode doesn’t obscure that part either. I would appreciate help. I use firefox with Dark Reader Extension.

You can use night mode on the builder, click on the sun icon on the upper right corner. When is activated icon will change to a moon

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Yes, I tried the night mode, but it’s still very white. i need dark color.