The biggest concerns relate to dark logos and transparent images. Switching from a default light template to a dark background color could lead to readability issues that may decrease usability and ruin the appearance of your website.

For example, a dark logo on a light background may disappear entirely if your readers enable Dark Mode on their side. Similar concerns relate to image brightness and contrast and opacity of borders, dividers, and separators.

For this reason, if you are planning to provide Dark Mode support for your website, you should also take into account how your website will look with a dark background.