With a custom CSS file, you can modify almost every part of your app's user interface. Here is a screenshot of an app that's using a custom CSS file to create a "dark mode" user interface:
CSS (cascading style sheets) is a rule-based language for defining web page styles. Your app's background color, text size, button styles are all controlled by CSS.
If you have a Business subscription (see pricing), you can upload your own CSS file under Settings > Styles in the app builder:
Your custom CSS file is used in addition to one of the default styles (Classic, California, or Brooklyn). You must write your custom CSS in such a way that it is given priority over a conflicting default style. Quick lesson on CSS: if there are two or more conflicting CSS rules for a particular element on your website, the most specific rule is given priority.
One of the easiest ways to make your CSS rules more specific than the default is by prepending html, like this:
CSS allows you to edit the "look and feel" of a web page. It does not, however, allow you to rearrange or add the functional elements of a website. For example:
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