Paste this block into your theme’s functions.php file to see your Jetpack CSS disappear.
Code to remove WordPress Jetpack CSS
function remove_jetpack_styles(){
wp_deregister_style('AtD_style'); // After the Deadline
wp_deregister_style('jetpack-carousel'); // Carousel
wp_deregister_style('grunion.css'); // Grunion contact form
wp_deregister_style('the-neverending-homepage'); // Infinite Scroll
wp_deregister_style('infinity-twentyten'); // Infinite Scroll - Twentyten Theme
wp_deregister_style('infinity-twentyeleven'); // Infinite Scroll - Twentyeleven Theme
wp_deregister_style('infinity-twentytwelve'); // Infinite Scroll - Twentytwelve Theme
wp_deregister_style('noticons'); // Notes
wp_deregister_style('post-by-email'); // Post by Email
wp_deregister_style('publicize'); // Publicize
wp_deregister_style('sharedaddy'); // Sharedaddy
wp_deregister_style('sharing'); // Sharedaddy Sharing
wp_deregister_style('stats_reports_css'); // Stats
wp_deregister_style('jetpack-widgets'); // Widgets
}
add_action('wp_print_styles', 'remove_jetpack_styles');
The above PHP code below creates a function called remove_jetpack_styles and adds that function into WordPress’ wp_print_styles hook. Inside the function, the wp_deregister_style function runs on the CSS handles for 10 different Jetpack modules and their variations.
Paste that code into your theme’s functions.php file and your Jetpack modules will lose their styles. Delete or comment-out any of these lines that you don’t want. That is—if there are Jetpack modules whose styles you don’t want to remove, delete them from this list.
Disclaimer: I haven’t tested every module. I can confirm that this will work perfectly with the Grunion Contact Form and Jetpack Widgets modules. I’m making an assumption on all the other modules. Please let me know in the comments below if your mileage varies.