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Seventy extends Seven, the default admin theme in Backdrop. More precisely, it
doesn't do much on its own, but it provides a place which lets you extend Seven
easily. Seventy provides a good start to give the administration and editorial
interface in Backdrop a different look.

Seventy as a sub-theme

Seventy is a sub-theme of Seven, and Seven serves as base theme for Seventy.
As a sub-theme, Seventy inherits most resources of Seven. When you start to use
Seventy, your administration pages will look exactly like Seven. However,
Seventy comes with an empty skin-seventy.css which makes it easy to override
the CSS styles of Seventy and/or to add your custom styles.


  • Install and enable Seventy using the official Backdrop CMS instructions at
  • Go to Administer > Site building > Themes, scroll down a bit, and choose
    Seventy as Administration theme.


Open the file css/skin-seventy.css, and add your styles.

Override a Seven style

Example: Override Seven's gray header background color with a light blue.

.l-header::before {
  background-color: #e3f2fd;

Add your own custom style

Example: Add some margin for a content form field.

.field-type-text-with-summary {
  margin-bottom: 2em;

More examples can be viewed and edited in the Wiki.

Advanced usage

Apart from CSS styles, Seven includes template files, images and more. To
override template, JavaScript or PHP files in Seventy, refer to the Documentation
about sub-theming:

Alternatives to Seventy

Write your own Seven sub-theme

Writing your sub-theme from scratch can be fun, you will learn a lot, and it
gives you the most freedom. Please refer to the sub-theming documentation
mentioned above.

Install the CSS Injector module

CSS Injector allows you to add CSS to Backdrop based on configurable rules.
It's useful for adding simple CSS tweaks without modifying the theme.


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 the complete text.