Creating an custom theme

The user interface is styled using bootstrap v5. All variables documented at are available to you to design your look and feel.

Proceed with the following steps to compile a custom theme:

  1. Install node.js:
    Download and install the node.js javascript runtime environment from
    The installation also makes the npm command available which we’ll use in the following steps.
  2. Install grunt command line tools:
    Grunt is a javascript task running utility.
    Install it with the command:
    npm install grunt-cli -g
  3. Install the javascript dependencies:
    Compiling the frePPLe and bootstrap styles requires a number of javascript libraries. Install these with the following command:
    npm install
  4. Design the LESS files:
    The styles are defined in the following files. Check out to learn more about the Less syntax used in these files.
    • freppledb/common/static/css/frepple.less:
      Defines the frePPLe specific CSS styles.
    • freppledb/common/static/css/THEME/variables.less:
      Defines the configuration of bootstrap for each of the themes. The value of the variables is what a theme unique.
    • freppledb/common/static/css/THEME/frepple.less:
      Optionally, you can create files with theme-specific styles that can’t be expressed as variable values.
  5. Compile the LESS files:
    The less files need to be compiled into a CSS stylesheet for each theme. Edit the gruntfile.js file to include your theme in the list of themes, and then run the following command:
    grunt less

    In each of the theme folders the file bootstrap.min.css and will be generated.

  6. Update file:
    New themes are only shown in the user interface when the theme is configured in the setting THEMES.
    You can also edit the setting DEFAULT_THEME to make your theme the default one.