nextcloud-news/docs/features/customCSS.md

Custom CSS

Sometimes you want to add additional CSS for a feed to improve the rendering. This can very easily be done by adding a CSS class to css/custom.css following the following naming convention:

• Take the URL from the <link> attribute (e.g.: <link>https://www.google.de/path?my=query </link>)
• Extract the Domain from the URL (e.g.: <www.google.de>)
• Strip the leading www. (e.g.: google.de)
• Replace all . with - (e.g.: google-de)
• Prepend custom- (e.g.: custom-google-de)

Each class rule should be prefixed with #app-content and should only affect the article body. An example rule would be:

#app-content .custom-google-de .body {
    /* Custom CSS rules here */
}