Event's date next to the title lacks styling on mobile

[Canapin (Coin-coin le Canapin)]

Desktop:

Mobile (I was really confused when I read it ):

[Moin]

This was also mentioned here

Discourse Calendar (and Event)

On mobile there is no nice box around the extra text it adds to the topic title: [IMG_0018] (“3 days ago” should be in a box) Why is it missing? How can I add it in, do I just need to recreate the CSS?