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I have a single page website, and I am satisfied with the layout of this page. Now I want to add more pages.
How can I make the new pages have the look of the existing page? I'd like the layout to be simliar, with background color, header, fonts, etc.

You can duplicate the page.
There is a plugin for that.
Impossible to say without knowing how you did the layout on the existing page. Did you code it by hand? Did you use a page builder? If you used a page builder, which page builder did you use?
You can! It’s easy!
Click on the “Template” and save your whole thing as a New Template – then when you start a new page, click that same Template link where it will read “page” by default and choose the one you saved
https://i.redd.it/g59bs25fqsod1.gif
Save as Pattern is another option – hit the hamburger menu to open the page block list of contents & select-all, then hit three dots & “Create Pattern”
https://i.redd.it/2x09mct9rsod1.gif