CSS helps you to properly structure your website pages with respect to font size and other factors. Due to ignorance or confusion, some users block CSS files. This may prevent Google from indexing your website as it may not be able to read your content well if you block CSS.
As per Google’s instructions you are not supposed to block CSS. You are not supposed to block Java Scripts unnecessarily. If you do that it may hamper your indexing and it will definitely impact your ranking. This may happen by mistake as your webmaster did it or you did it by mistake.
You can know this with the help of Google Webmaster tools. You can also check Robots while to see whether you have blocked CSS files. If yes, you can easily undo by removing the CSS filed from the blocked file folder.
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