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 );
}