Your Custom CSS

Has an option for loading separate backend and frontend code.

A WP admin panel settings page is added under the Settings tab where the admin can go and add his code.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

What is new in this release:

• Tested up to WordPress 3.8-alpha.

What is new in version 1.1:

• Ready for WordPress 3.4.

What is new in version 1.0.1:

• Ready for WordPress 3.3.

Requirements:

• WordPress 3.1 or higher