Hi

Thanks for contacting us. For changing the background image you have to use this CSS, just set the image address which image you want to set.

.sp-page-builder .page-content #section-id-69TUdUC7aXXOhP7Or5Zoz.sppb-element-loaded{
  background-image: url(img.freepik.com/premium-photo/abstract-plexus-background-with-connected-lines-dots-wave-flow-plexus-geometric-effect-big-data_230610-893.jpg) !important
}

And in there icon-vector is used.

-Regards.