I could not make it work.
Added a css file on, in my case: C:\Users\Username\AppData\Local\Continuum\Anaconda2\Lib\site-packages\dash_core_components-0.13.0rc1-py2.7.egg\dash_core_components
It seems that Dash doesnt recognize it. Any idea of how to solve this? @chriddyp @mikesmith1611
Thanks a lot