nevermind, i fixed it.
Well, if anyone else ever has this problem where their moodle site wont load due to a change in the Custom CSS of a theme, follow these steps:
1. ftp into your moodle site
2. change the name of the theme.css file
3. ssh into your moodle site and restart apache or whatever you are using
4. change the name of the theme.css file back to its original name