Describe the bug
When event logos have a ratio higher than 3:1, it will offset text alignement within the cover of the timetable PDF

To Reproduce
Steps to reproduce the behavior:

1. Upload an event image logo with a ratio higher than 3:1 (see example here: https://indico.mitp.uni-mainz.de/event/413/)
2. Change the event title to a text with a character count > 50 (edge case example)
3. Change the address to a text with a character count > 70 (edge case example)

Expected behavior
The text should be centered as well as the image, vertically and horizontally.

Screenshots