There are two ways to have DocBoss appear in dark mode:
1. Using a contrast theme (system settings)
Applying a contrast theme will adjust the colouring of anything that appears on your screen. On Windows, a contrast theme can be applied from Settings > Accessibility > Contrast themes.
2. Installing a 3rd party application in the browser
While we cannot speak to the safety or quality of these products, there are browser applications available that will adjust the colouring of web pages.