Add last after all filters to make sure it always overrides // Deprecated in 4.0 - the theme now uses native WP additional css function for the custom css. if ( $css = wpex_get_mod( 'custom_css', false ) ) { $output .= '/*CUSTOM CSS*/'. $css; } // Minify and output CSS in the wp_head if ( ! empty( $output ) ) { // Sanitize output $output = wp_strip_all_tags( wpex_minify_css( $output ) ); // Echo output // Don't rename #wpex-css or things will break !!! Important !!! echo ''; } } /** * Filter the WP custom CSS to minify the output since WP doesn't do it by default * * @since 4.6.5 */ public function minify( $css ) { return wpex_minify_css( $css ); } } new InlineCSS();