[support] css files

I'm debuging and trying to modify the calendar css because the little blue info field is too small to display sufficient info.

Firebug shows <div class="calendar monthview"> and the style allows me to modify width and height of the blue display field. But the url /sites/default/files/css/css_TuUcIk9BkwT2jDjJe_6dJMP9rOL2wZwiKQmxadx5Vvc.css shows dozens of files in the /css folder.

Are these temporary files generated each time a display request is made? Where is the real calendar css that I can change to permanently display my alterations to width and height for the info field? Thanks in advance Roger