wp_add_inline_style Example

add_action( 'wp_enqueue_scripts', 'custom_titles_color' );
function custom_titles_color() {

    $css = '
        body {
            color: red;
        }';

    wp_register_style( 'dma-inline-style', false );
    wp_enqueue_style( 'dma-inline-style' );
    wp_add_inline_style( 'dma-inline-style', $css );

}