// ========================================================================= // ADD POST CATEGORY TO BODY CLASS // ========================================================================= function add_category_to_body_class( $classes ) { if ( !is_single() ) return $classes; $post_categories = get_the_category(); foreach( $post_categories as $current_category ) { $classes[] = 'category-' . $current_category->slug; } return $classes; } add_filter( 'body_class', 'add_category_to_body_class' );