Catch the CSS bugs your browser silently hides.
Paste any CSS, however long. A whole HTML page works too, and only its style blocks are scanned. The scan lists every problem with the line it sits on and a fix you can copy, and one click can repair the safe ones for you.
or press Ctrl + Enter
Scan report
This is a static scan of the CSS you pasted. Treat each result as a lead to verify. Some findings can be false alarms, and styles that other files override or that scripts add later cannot be seen.