I only provide code that works in developer console while viewing your website.
I need to see your web page source code, so that I can determine if there is any previously entered css code that has broken syntax. Any css code with syntax error can affect subsequently entered css code.
Please find the setting in your W3 Total Cache plugin to disable all caching.
Keep your W3 Total Cache’s caching disabled until we fix your issue.
Let’s see if I can fix this issue, if not, you can convert to using elastic slider.