Request to add option to fill page or make reactive

**Is your feature request related to a problem? Please describe.**
I have a few notifications that are long and wide and I have to scroll to get to the horizontal scroll bar to see the wider notifications.

**Describe the solution you'd like**
It would be nice to have the notifications window fill the available area to allow for viewing the wider notifications either with an option to "fill" or have the notification area be reactive to the size of the screen or window viewing them.

**Describe alternatives you've considered**
not using Gotify as there are others that offer this but aren't as easy to configure if there is no native Gotify support.

**Additional context**
none at the moment as the above should suffice, but let me know if you have questions.