I want to place a shortcode with some css styling in the header bar…it seems the shortcode works but when I add css I get this error screen every time:
The page you are trying to access is restricted due to a security rule.
If you believe the security rule is affecting the normal operation of your website, contact your host support team and provide detailed instructions how to recreate this error.
They will be able to assist you with rectifying the problem and adjusting the security configuration if needed.
The error you described above looks like occurring because of some security plugin. Have you enabled any such plugin on the website. If so, please try deactivating the plugin and then check if the problem persists or not.
The error is not occurring because of responsive menu plugin as there are no security rules used in the plugin. Although it is made in such a way to enhance productivity using shortcodes and custom CSS.