Google is testing a highlighted background for its sponsored results and the section beneath them on mobile. I spotted this while searching on Google the results appeared under the “Sponsored Results” heading, and once that section ended, the entire block was visually highlighted, standing apart from the rest of the page.
Here is a screenshot of how it looks.

Testing this type of highlighted styling on mobile could be Google way of making sponsored results stand out more, potentially catching users’ attention more easily than a standard, unstyled listing would.
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