Child Themes

Child themes provide an easy way to add custom assets, override template files or extend YOOtheme Pro with more functionality. All customizations are preserved during updates of YOOtheme Pro.

A WordPress child theme is used to make modifications to any part of YOOtheme Pro. It has its own theme directory next to the yootheme directory. This way customizations are separated from YOOtheme Pro which makes them portable, replicable and unaffected by YOOtheme Pro theme updates. Typically, a child theme is used for the following customizations.

  • To add JavaScript, CSS and fonts
  • To add Less styles to the style library
  • To override templates files
  • To add builder elements to the element library
  • To extend YOOtheme Pro with custom PHP code

Note YOOtheme Pro provides custom code settings where you can add custom JavaScript, CSS or Less. This may be sufficient for smaller customizations without the need to create a child theme. They can be found in the Settings → Custom Code panel of YOOtheme Pro. Additionally, each page builder element has an option to apply custom CSS in the Advanced tab of the element settings.

Create a Child Theme

Open the WordPress theme directory wp-content/themes and create a new folder yootheme-NAME for the child theme. The suffix is name of the child theme, for example yootheme-mytheme. Next, create a style.css file and add a header comment with additional information at the very top of the file.

 Theme Name:   YOOtheme MyTheme
 Template:     yootheme
 Author:       John Doe
 Description:  YOOtheme Child Theme
 Version:      1.0.0
 Text Domain:  yootheme-mytheme

Set the Template parameter to yootheme to define that the child theme has YOOtheme Pro as parent theme.

Once the stylesheet file is created, the child theme can be activated in the WordPress theme administration. Follow the WordPress child theme documentation for more information.

Important A child theme in WordPress has its own settings which are independent from the parent theme. When activating the child theme for the first time, all settings from the parent theme are copied and applied to the child theme. This also includes the menu settings and widget assignments.

JavaScript, CSS and Fonts

YOOtheme Pro automatically loads the custom.js and custom.css files from the respective js and css directory if available in the child theme. Just create one of those files and add your custom code. It's the easiest way to quickly load additional CSS or JavaScript. To load specific JavaScript or CSS files take a look at the modules and events documentation.


To load a custom font, create a fonts directory with all the needed font files. Add a @font-face at-rule to the css/custom.css file and specify the font resources.

@font-face {
    font-family: "Custom Font";
    src: url("../fonts/custom-font.woff2") format("woff2"),
         url("../fonts/custom-font.woff") format("woff");

The font Custom Font can now be used in CSS. To set the font in the style customizer, open the font picker and instead of selecting one of the proposed fonts, type in the name Custom Font into the the search field and hit the Enter key.

Set a custom font in the style customizer

Note When a Google font is selected in the style customizer, it's automatically downloaded to the web server and stored locally. There is no round-trip to the Google Fonts server, which is great for page speed and GDPR-compliance. There is no need to add a custom font manually in the child theme if it is already available in the style customizer.

Less Styles

Styles in YOOtheme Pro are built with the UIkit framework. They are basically UIkit themes written in Less and customizable through the style customizer in YOOtheme Pro. Working with UIkit and Less usually involves overwriting Less variables, extending existing CSS rules by using Mixins or adding your own CSS rules. Learn more about customizing UIkit in the UIkit themes documentation.

To add a custom style to the style library, create a less directory in the child theme and add a file theme.NAME.less. The suffix is the name of the style, for example Once the file is created, the style My Style can be selected in the style library.

Add a header comment with additional information at the very top of the file to show a custom preview image and to define under which filter options it is available. Optionally, set a name which will be used instead of the file name in the style library.


Name: My Style
Background: White
Color: Black
Type: Flat
Preview: my-style.jpg


Now you can create your custom style. There are few ways to get started.

Modify a Style

The easiest way is to customize an existing style. Just import it into the Less file and add your customizations.

// Import an existing style, for example `Fuse`
@import "../../yootheme/less/theme.fuse.less";

// Add custom Less code here

There are over 40 styles available in YOOtheme Pro. Their Less files can be found in the less directory in YOOtheme Pro.

Modify a Style Variation

Each YOOtheme Pro style comes in 5 further style variations. To start with a style variation, just import both, the style and its variation, into the Less file.

// Import an existing style, for example `Fuse`
@import "../../yootheme/less/theme.fuse.less";

// Import a style variation, for example `dark-yellow`
@import "../../yootheme/vendor/assets/uikit-themes/master-fuse/styles/dark-yellow.less";

// Add custom Less code here

The available variations of a style can be found in the corresponding style vendor/assets/uikit-themes/master-STYLENAME/styles directory in YOOtheme Pro.

Start from Scratch

To create a style from scratch, import the necessary base styles. This includes files for the WordPress, the UIkit framework, the Master UIkit Theme and the YOOtheme Pro theme.

// Import platform specific styles for Wordpress or Joomla
@import "../../yootheme/less/platform.less";

// Import the UIkit framework
@import "../../yootheme/vendor/assets/uikit/src/less/uikit.less";

// Import the `Master` UIkit Theme which extends the UIkit framework
@import "../../yootheme/vendor/assets/uikit-themes/master/_import.less";

// Import the YOOtheme Pro theme specific styles
@import "../../yootheme/less/theme.less";

// Add custom Less code here

Template Files

Template files like the index, header, menu or widget templates can easily be customized. Simply add a template file to the child theme, and it will override the exact same file in YOOtheme Pro. It’s recommended to copy the original file from YOOtheme Pro to the child theme and start modifications from there.

Any WordPress template file can be included in the child theme, not just the ones from YOOtheme Pro. Learn more about how to override the different template files in the WordPress template hierarchy documentation.

Here is an overview of all template files in YOOtheme Pro.

Theme Templates

The following template files serve as entry points to the WordPress site.

Template Description
index.php Renders blog pages. Used if no other matching template file is found.
archive.php Renders archive pages.
search.php Renders search results pages.
single.php Renders all single posts.
page.php Renders all pages.
404.php Renders 404 pages.

The actual theme layout can be found in the header.php and footer.php files. All above mentioned template files include the header.php file before their content output and the footer.php file afterwards.

Template Partial Description
header.php Renders the toolbar, header, top and main sections of the theme.
footer.php Renders the sidebar, bottom and footer sections of the theme.

The following template partials are used across the template files.

Template Partial Description
comments.php Renders comments. Included in single.php and page.php.
commentsform.php Renders the comment form. Included in comments.php.
templates/post/content.php Renders posts. Included in index.php, archive.php and single.php.
templates/post/content-search.php Renders results on search pages. Included in search.php.
templates/post/content-none.php Renders a message if posts cannot be found. Included in index.php, archive.php and search.php.
templates/post/content-page.php Renders pages. Included in page.php.
templates/meta.php Renders the meta information. Included in all post templates.

Section Templates

The following template files render the different sections.

Template Description
templates/section.php Renders the section for the top and bottom areas.
templates/sidebar.php Renders the sidebar for the sidebar area.

Header Templates

The following template files render the different header layouts.

Template Description
templates/header.php Renders the header and its navigation.

The following template partials are included by the header.php.

Template Partial Description
templates/toolbar.php Renders the toolbar.
templates/header-mobile.php Renders the mobile header and its navigation.
templates/header-logo.php Renders the logo.
templates/search.php Renders the search toggle and field.
templates/socials.php Renders the social icons.

Widget and Area Templates

The following template files render the widget area layouts.

Template Description
templates/position.php Renders the area.
templates/module.php Renders the widget.

The following template files render the different menus.

Template Description
templates/menu/menu.php Renders the menu.
templates/menu/nav.php Renders menu items for the vertical nav.
templates/menu/navbar.php Renders menu items for the navbar.
templates/menu/subnav.php Renders menu items for the subnav.
templates/breadcrumbs.php Renders the breadcrumb navigation.
templates/pagination.php Renders the pagination.

Builder Elements

To add a custom element to the page builder, create a builder directory in the child theme and copy the custom element into it. It will be loaded automatically by YOOtheme Pro and will be available in the element library. For more information on how to create a custom element read the custom elements documentation.

Advanced Customizations

To extend YOOtheme Pro with custom functionalities, add a file config.php to the child theme directory. It will be loaded automatically by YOOtheme Pro. Here you can register your own classes with functions that listen to the events. For more information read the modules and events documentation.

YOOtheme Pro Documentation