When achieving an advancement and it displays in chat, going to bed afterwards and hovering the cursor over the green text displays the advancement with information. When the cursor moves down and the box moves with it, it overlaps with the "Leave Bed" button.

What I expected to happen was...:
The box to be layered over the button entirely

What actually happened was...:
The background layered under the button so that the text (Which is white) is hard to read against the button.

Steps to Reproduce:
1. Achieve an advancement
2. Go to bed
3. Hover cursor so the box+text appear over button