LOOT’s user interface has CSS theming support. A dark theme is provided with LOOT: to use it, select it in the Theme dropdown in LOOT’s settings dialog.

Themes are installed in the resources/ui/css directory, relative to LOOT.exe. Theme CSS files must be named <theme name>.theme.css to be detected as such by LOOT. A working knowledge of CSS is required to create new themes, though the provided dark theme CSS file is commented to provide some assistance.