by John Regan on WordPress.org

Add Custom CSS to your WordPress site without any hassles.
An easy-to-use WordPress Plugin to add custom CSS styles that override Plugin and Theme default styles. This plugin is designed to meet the needs of administrators who would like to add their own CSS to their WordPress website. Styles created with this plugin will render even if the theme is changed.
New in Version 4.0.7
Navigate to Appearance > Custom CSS in the Admin Menu
Enter in valid CSS styles
Click “Update Custom CSS”
View your changes in the Front End of your website