1. Navigate to the ch2-private-item-text folder of the WordPress plugin directory of your development installation.
2. Open the ch2-private-item-text.php file in a text editor.
3. Add the following line of code after the existing functions to register a function that will be called at the beginning of the WordPress page display process:

add_action( 'wp_enqueue_scripts', 'ch2pit_queue_stylesheet' ); 

4. Add the following code section to provide an implementation for the ch2pit_queue_stylesheet function:

function ch2pit_queue_stylesheet() { 
    wp_enqueue_style( 'privateshortcodestyle',
                      plugins_url( 'stylesheet.css', __FILE__ ) ); 
} 

5. Save and close the plugin file.
6. Create a new text file in the plugin's directory called stylesheet.css and open it in a code editor.
7. Add the following content to the file:

.private {  
    color: #6E6A6B; 
}

.register { 
    background-color: #ff4d4d;
    color: #fff;
    padding-left: 10px;
} 

8. Save and close the text file.
9. Navigate to your website, making sure you are logged in, and refresh the page containing the private text content. You should notice that the text is now displayed in gray.
10. Log out of the site and refresh the page to see that the registration message styling has also changed.