The private Content area is empty. Please check and provide credentials.
1. Please create an empty dynamic.css file in royal-child theme folder and set permissions 777 for the file + add wp_enqueue_style( 'dynamic-css', get_stylesheet_directory_uri() . '/dynamic.css' ); in royal-child/functions.php file. Then go to Theme Options and re-save them. (From the 4.0 update, all the custom styles come not like inline CSS but as styles from separate file – dynamic.css (to speed up the site loading). If you created child theme before 4.0 update you need to create the dynamic.css file.)
4. Please provide screenshot of the problem. You can use such screenshot maker as Lightshot and provide screenshot link in Private content area.
Also, Fixed header color scheme can be changed to Dark in Theme Options > Header Settings > Main header area.