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Basic Child Theme for UnderStrap Theme Framework:

How it works

Understrap Child Theme shares with the parent theme all PHP files and adds its own functions.php on top of the UnderStrap parent theme's functions.php.

IT DOES NOT LOAD THE PARENT THEMES CSS FILE(S)! Instead it uses the UnderStrap Parent Theme as a dependency via npm and compiles its own CSS file from it.

Understrap Child Theme uses the Enqueue method to load and sort the CSS file the right way instead of the old @import method.


  1. Install the parent theme UnderStrap first:
    • IMPORTANT: If you download UnderStrap from GitHub make sure you rename the "" file to "" or you might have problems using this child theme!
  2. Upload the understrap-child folder to your wp-content/themes directory
  3. Go into your WP admin backend
  4. Go to "Appearance -> Themes"
  5. Activate the UnderStrap Child theme


Add your own CSS styles to /sass/theme/_child_theme.scss or import you own files into /sass/theme/understrap-child.scss

To overwrite Bootstrap's or UnderStrap's base variables just add your own value to: /sass/theme/_child_theme_variables.scss

For example, the "$brand-primary" variable is used by both Bootstrap and UnderStrap.

Add your own color like: $brand-primary: #ff6600; in /sass/theme/_child_theme_variables.scss to overwrite it. This change will automatically apply to all elements that use the $brand-primary variable.

It will be outputted into: /css/understrap-child.min.css and /css/understrap-child.css

So you have one clean CSS file at the end and just one request.

Developing With NPM, Gulp, SASS and Browser Sync

Installing Dependencies

  • Make sure you have installed Node.js, Gulp, and Browser-Sync [1] on your computer globally
  • Open your terminal and browse to the location of your UnderStrap copy
  • Run: $ npm install then: $ gulp copy-assets


To work and compile your Sass files on the fly start:

  • $ gulp watch

Or, to run with Browser-Sync:

  • First change the browser-sync options to reflect your environment in the file /gulpconfig.json in the beginning of the file:
  "browserSyncOptions" : {
    "proxy": "localhost/wordpress/",
    "notify": false
  • then run: $ gulp watch-bs

[1] Visit for more information on Browser Sync