If you've downloaded and used the Divi dark child theme I released then you might be interested in using these free dark page layouts.
You'll notice that once you turn your site dark a lot of the page templates that come with Divi are based on white backgrounds. So I've gone through each of the originally included page layout templates and made them use all black as a background color. This will save you some time from having to go through and changing all the settings for each layout yourself.
Once you’ve saved the download file, you can use the Import function in your WordPress installation to import all layouts. It's under Tools > Import then select WordPress in your WordPress admin dashboard. You need to extract the file from the zip file first before you upload it. Once you've imported the file you'll now see the dark page layouts in the layouts window when you click on “Load Layout” when you're creating a new page and have “Use Page Builder” on.
If you don't own a copy of Divi yet you might want to consider purchasing a license for it so you can use these layouts for your website.