Themes

You can apply one of the predefined themes in the Settings. Select the theme from the dropdown.

Built-in themes

Default

Apple Books

Dark slate

Night

LingQ

LWT

Custom themes

You can add your own custom themes as .css files in the userthemes folder in your data directory (see Home > About).

New files (e.g. "my_theme.css") are added to the theme dropdown list.

You can also tweak the built-in themes by adding a similarly named file to that directory. E.g., for the "Apple Books" theme, create a file called "Apple_Books.css". Any styles you add in your personal file are applied after the existing styles in the theme. The existing themes are in the GitHub repo.

"Change theme" hotkey - "m"

You can quickly cycle through the themes while reading by hitting the "m" hotkey. Find what feels best.