Custom CSS

You can apply custom CSS styles on a per-site basis

Site wide CSS is configured via the Appearance > CSS tab of the site editor.

All elements within a form schema can have a styleClasses key that can take a string of space separated CSS classes. The below example adds the class my-red-box to an input element.

  "inputType": "text",
  "label": "My Input",
  "model": "field1",
  "styleClasses": "col-md-3 my-red-box",
  "type": "input"

This class is defined in the CSS section of the Site / Appearance as follows:

.my-red-box {
    border-width: 2px;
    border-color: red;
    border-style: solid;
    padding: 20px;

Page scoped classes

To target specific forms in your app, you can add a styleClasses key. This will allow you to still keep your CSS in a single location and theme pages separately.

Resulting is something similar to the following:

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