How-To Center Align SiteOrigin Testimonials Widget

For the sake of future visitors, I will post here a working solution for how to center align the SiteOrigin Testimonials Widget (which by default is left-aligned).

Add this css style to your custom css (https://it.wordpress.org/plugins/simple-custom-css/) or child theme css file:

.sow-testimonials {     
  display: flex;
  justify-content: center;
}

Hope this helps :)