Urgent Where Is The Css File That Is Edited In The Visual Editor Urgent Urgent

I've added a rule thats messed my site up. Can't't acces it through the visual editor. Where is this custom CSS file stored so I can delete this rule?!

I've added a rule thats messed my site up. Can't't acces it through the visual editor. Where is this custom CSS file stored so I can delete this rule?!

Here is the directory:

design/themes/[THEME_NAME]/styles/data

Thanks guys, sorted it. Wanted to cry for a minute haha