On launch it opens a new finder window in fixed size
...Just put this compiled script into the dock and you have it at hand quickly.
Alternatively I wrote a service which can be installed easily and assigned a keyboard shortcut to execute this code (when the finder is topmost application, just by clicking into the dock for example).
Developed and tested on Mac OS X 10.11.5
A service to close notifications with a keyboard shortcut.
When you have lots of notifications on the screen, you simply switch to the Finder by clicking on the desktop. Then you click a keyboard shortcut and voilà: All notifications dissapperar.
For notifications in "Alert Style" (with buttons) only.
Developed and tested on Mac OS X 10.11.5