Create a responsive mobile theme based on a default theme

What’s in this topic

The topic describes how to create a responsive mobile-specific theme using the default Magento approaches.

Creating a mobile-specific theme

To use all the responsive approaches implemented in the Magento out-of-the-box Blank and Luma themes, your theme should declare one of them as a parent.

To create a mobile-specific theme:

  1. Create a theme as described in Create a theme, having specified Blank or Luma as a parent theme.
  2. Add a <theme_dir>/Magento_Theme/layout/default_head_blocks.xml layout file with the following content:
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<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <head>
        <remove src="css/styles-l.css" />
    </head>
</page>

The <remove> instruction removes the desktop-specific files from your theme.

Applying mobile-specific styles

Use styles-m.less to generate mobile-specific styles.

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<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
  <head>
    <remove src="css/styles-l.css" />
    <css src="css/styles-m.css" />
  </head>
</page>

Media queries @media-common, max screen__m, max screen__s, max @screen__xs and max @screen__xxs will be added to styles-m.css.

Example of a LESS mixin to target screen width less than 480px:

.media-width(@extremum, @break) when (@extremum = 'max') and (@break = @screen__xs) {
    // your code
}

CSS in Magento responsive design