When creating or editing the configuration of a form, you can select a CSS style by selecting “CSS STYLE”

Here you can choose between two types of themes:

A light and a dark theme

For the required inputs, the forms insert the “.adb-invalid” class by default, the default themes add a red background/border when the inputs are not compiled.

If we want to customize the form with our own style, we must remember that the requested and uncompiled inputs are inserted with the class “adb-invalid”, to which we must associate our CSS style to highlight any errors.