Originally Posted by StopDrop
All that did was basically remove all of my other custom css.
It looks like a syntax error, for example you could copy and paste the code somewhere inside your custom theme and delete one of these: "}" in the process. That way everything below that missing brace didn't work.
I've added the code to the ecwid css file of your site in my browser and it works. So why don't try this: Add again the code and if it doesn't work post a copy of the custom theme before removing it to find the error.