Bing is testing light blue bubbles on desktop. Previously, these appeared with a white background.
Bing recently made a similar change to its “People also ask” questions, switching the background to light blue. That change appears to be live for everyone, so Bing may be rolling the same color treatment out to sitelinks.
Here is a screenshot of this.

This is just a color change, but personally I think it looks good and could make the sitelinks easier for users to notice.
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