CSS being cached



In the past weeks I have been using C9 to work on my project. Never had any problems untill today. I tried to change my CSS and its not updating.
Yes i tried all refresh options even cleared my cache and history.
Even changed my css link to custom.css?v=1.0.3
When i open the css in a new tab it does show me the new code. But when im on my site it doesnt show the most recent update.

Does anyone have a idea?