Works very well as a quick 'n' dirty way to style a site using CSS without touching the original style sheet or making a child theme. However, it also styles the admin CSS so as you make changes to the live site CSS you will find the look of your admin changing too. I used a 'display:none ' tag on an element and it hid access to my pages and posts. It took me a good 15 minutes to figure out what was going on. As a result this plugin is unusable for me.