Hi Harald,
This seems an old post however noticed that you have not marked as "Answered"
The below script in CSS seems to work perfectly fine for me
| display: flex; | |
| justify-content: center; | |
| flex-direction: column; | |
| height: auto; |
Below are some additional links explaining this in detail. Hope this helps
https://css-tricks.com/centering-css-complete-guide/
Centering in the Unknown | CSS-Tricks
Regards,
Premdas