:root { --size-spacing-small: 20px; } /* To enable a theme in your HTML, simply add one of the following data attributes to an HTML element, like so: You can apply the theme on any DOM node, not just the `body` */ [data-size-mode="desktop"] { --size-spacing-small: 20px; } [data-size-mode="mobile"] { --size-spacing-small: 16px; }