Amazon S3 and 'Resource interpreted as Stylesheet but transferred with MIME type binary/octet-stream'

If you use Amazon S3 to serve your static CSS you may end up with this error message 'Resource interpreted as Stylesheet but transferred with MIME type binary/octet-stream'

1. You have to log in into Amazon S3 console
2. Navigate to the file in question
3. Open Properties and click to the Metadata
4. You can see a Content-Type field with the value binary/octet-stream, change it to text/css

Something like this