Body tag with more classes such as locale and page slug.

It adds a CSS class to the body depending on the parameters included in the URL

WP Christmas Class allows you to dynamically add a custom CSS class to your body tag during a date range of your choosing.

Make your site react to users' context by changing your theme's CSS and JavaScript files, navigation menus, sidebars and the HTML body tag.

Add safely-prefixed custom classes to Pages, Posts, CPTs, and WooCommerce views—no theme edits required.