Custom CSS isn't showing up on live site

I have been working on a website and included a lot of custom code, it shows up when I'm in the CSS editor - but once I go onto the live site it isn't showing up.

I've looked at any errors, and fixed anything I could see but it is still not working.

I'm happy to send the code and website privately. 

Thank you! 

You can try running your CSS through http://csslint.net/ to check for any errors. Sometimes that picks up on something I've missed. You can typically ignore the warnings and just look for errors.

Thank you - I did this already and cleared up all the errors. There are a few warnings but I'm not sure how to solve them.

PM me a link.