Mobile off canvas Menu Style

Thank you for a wonderful template and OS component. I am a bit outdate...can anyone point me to the file, where I can change the style of off-canvas menu on mobile. I was able to figure out for desktop ...but somehow I am stuck...I would appreciate pointing me to right direction. Thank you in advance.

I am stupid....darn...forgot to clean cache on mobiles....lol...oh boy... i am silly sorry topic closed.

OK Urszula