Sidebar widget alignment

Hi,

I would like to have sidebar on the right side of my posts. I figured out how to do that but what I am having problems with is the alignment. 

I would like all my widgets to be centered in the middle of the sidebar but it seems that widgets are centered by default on the left:
https://pasteboard.co/Iecfwcu.png

Is there any way to center it please? (and possibly all widgets in the sidebar by default).  I am using pre-built template extreme 2.

Thank you 

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