Step 1: Edit Your Page


Edit your page and open settings of the upper Section.


In a Classic SharePoint Page:



In a Modern SharePoint Page:



Step 2: Change Image


Open This Image and copy the link. Change section background.


In a Classic SharePoint Page:



In a Modern SharePoint Page:




Step 3: Publish the Page


Save your page to see the results that you have now.


In a Classic SharePoint Page:



In a Modern SharePoint Page: