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This module allows administrators to customize a theme's CSS through
the browser, using a rich text editor with syntax highlighting and
live preview.

The module has just one option in its configuration page. You can choose
which themes can use the custom CSS feature. So, on the settings page
of each theme enabled to use this feature, a textarea field wiil be made
available where the admin can enter custom CSS code. The admin can choose to
use a plain textarea or an editor with syntax highlighting (default).
The changes can be previewed live while being entered. This can be disabled
as well (default is enabled). This feature can be enabled and applied one or
more themes on the same site and all options can be previewed live. Not only the
default selection. The custom CSS code is injected after all the other CSS in
the theme loads.

Check this video to understand
better how it works.


This module requires that the following modules are also enabled:

  • None


  • Install this module using the official Backdrop CMS instructions at

  • Visit the configuration page under Administration > Configuration >User
    Interface > CSS Editor (admin/config/user-interface/css-editor) and enter
    the required information.

  • Any additional steps.
    Select one or more themes to implement the CSS Editor.


Additional documentation is located in the Wiki:


Bugs and Feature requests should be reported in the Issue Queue:

Current Maintainers



This project is GPL v2 software.
See the LICENSE.txt file in this directory for complete text.