I know you can validate your XHTML code, but are they're tools available to validate your CSS files ? Is that even possible.
Just try these services:
http://htmlhelp.com/tools/csscheck/
http://jigsaw.w3.org/css-validator/
Validate your CSS files with the form below, errors in your CSS can make your page not display correctly.
we can find the error of css using css validation related site. It help to find out css error. It helpful to increase seo work.
A CSS validator checks your Cascading Style Sheets to make sure that they comply with the CSS standards set by the W3 Consortium. There are a few validators which will also tell you which CSS features are supported by which browsers (since not all browsers are equal in their CSS implementation).