$custom_css_style = mytheme_custom_css();
/* Enqueue The Font CSS */
$custom_font_css_style = upfw_enqueue_font_css();
//add custom style
wp_add_inline_style( 'main-stylesheet', $custom_css_style );
wp_add_inline_style( 'main-stylesheet', $custom_font_css_style );

$custom_font_css_style = upfw_enqueue_font_css();

wp_add_inline_style( 'main-stylesheet', $custom_font_css_style );