Extending Lookbook / Inspector Panels

Styles & JavaScript

Adding styles

If you wish to specify custom CSS rules to style the contents of the panel, just include a <style> element in the panel partial template:

  h3 {
    color: green;

  <h3>My Custom Panel</h3> <!-- will be green -->
  <!-- ... -->

The <style> element will be removed when the panel is rendered and any styles will be automagically scoped to the panel that they are defined in, so they will not affect other panels or leak out to affect the styling of the UI in general.

Utility classes

There are a number of utility classes available for use in panels to make it easier to match the look and feel of the rest of the Lookbook UI.

  • .lookbook-panel: Apply to the panel’s root element
  • .prose: Apply to text content containers. Adds default prose styles to child elements.

Adding JavaScript

Lookbook uses Alpine JS for its UI, and it is available for use in panel templates too. It’s a great way to add interactivity without ever having to touch a script tag.

For example, to add a button to show/hide a piece of content in the panel, it’s as simple as this:

<div x-data="{ open: false }">
  <button @click="open = !open">Show/hide content</button>
  <div x-show="open">
    Some content here

Check out the Alpine JS documentation for more information.

Because of the way that new content is loaded in to the UI when navigation occurs, adding arbitrary JavaScript in a script tag within the panel template may not always work as expected, so it is recommended to use Alpine for adding interactivity where required.

User Guide

Extending Lookbook