CSS3 validator

W3C CSS Validation Service

Validator from W3C (The World Wide Web Consortium).

Since the validator is here, it means that if your CSS arranges it, then it will work correctly everywhere. The site is official.

I was generating a large CSS file, and there was some mistake. In such a large file, it is rather difficult to look for an error. Gave a link to this service and he immediately showed me what to do.

You can give a link to the file, upload a CSS file or enter the code into the form.

He will think a little and tell you what's wrong here.

Compress CSS. We drop the code in the form field and get a compressed version.
If compression did not like, choose a different level of conciseness.