White box on mobile version of macrumors

[abz1981]

Hey all
When reading through forum posts on the mobile version of this site I see a white box at the top. Why is that ?

 

[ChristianVirtual]

Maybe a screenshot would be good ...

<joke style:'bad'>And your white box is a compensation for the black box I had on my iPad with desktop version https://forums.macrumors.com/threads/1709983/ </joke> 😛

 

[richwoodrocket]

I believe that is an ad?