I've noticed that the inbox notification icon on Meta seems to have put on a little weight.
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Depicted below are the icons of both sites, with the main site on top, and meta on the bottom.

![Inbox icon on the main site][1]

![Inbox icon on the Meta site][2]




  [1]: https://i.sstatic.net/O0npg.png
  [2]: https://i.sstatic.net/UNR4f.png