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Allows administrators to inject CSS into the page output based on configurable
rules. It's useful for adding simple CSS tweaks without modifying a site's
official theme -- for example, a 'nighttime' color scheme could be added during
certain hours. The CSS is added using Backdrop's standard backdrop_add_css()
function and respects page caching, etc.

This module is definitely not a replacement for full-fledged theming, but it
provides site administrators with a quick and easy way of tweaking things
without diving into full-fledged theme hacking.

The rules provided by CSS Injector typically are loaded last, even after the
theme CSS, although another module could override these.


  • Install this module using the official Backdrop CMS instructions at

  • Visit the configuration page under Administration > Development > CSS Injector
    (admin/config/development/css-injector) to add CSS rules and to configure
    the settings.


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.