What bothered me was the design. The interface seemed neither modern nor focused on the content.

Fortunately, Miniflux supports custom CSS. I made extensive use of it and substantially reworked the theme.

The new theme offers the following advantages.

• The look is based on Feedbin, in both light and dark mode.
• The switch happens automatically based on the system setting.
• The main navigation is centered as an icon bar, and labels appear only for the active menu item or on mouse hover.
• Articles are limited to a fixed reading width, the body text uses a serif font, and the title is centered.
• The article action bar floats at the bottom of the screen.
• The selected entry in the list is marked by a thin accent edge.
• Settings, tables, and forms follow consistent spacing and corner radii.
• Below a screen width of 600 pixels, the navigation, tables, and dialogs adapt.
• Favicons, tags, enclosures, and the category and reading time details in the article header are hidden.
• If the system requests reduced motion, the animations are disabled.

Here are a few preview images:

The CSS code and a bit of JavaScript are in a GitHub repository, so I can apply changes quickly when needed. I welcome suggestions for improvement via GitHub. You can find the repo here: Maik-Wi/modern-mini-flux-theme