We recently launched a new feature for Dark Mode for both the admin controls and your website.
important note: currently for dark mode we invert the color for everything on the site except for iframes, images, videos, and the cursor.
You can enable/disable both the admin version and the site version by logging into your photofolio admin and clicking the Account tab and selecting Site Display (screenshot below).
The Auto light/dark mode switches are based on your computer system's dark mode settings. You can test those by switching on dark mode in both Apple OSX and Windows operating system.
For Apple OSX its under your system preferences > General > appearance
For Windows you can type in the search box for colors and this panel should show up