fix scrollpageheader, make min-, sidebar- and navigation-width into variables
fix scrollpageheader, make min-, sidebar- and navigation-width into variables

zammad/zammad,monotek/zammad,monotek/zammad,monotek/zammad,zammad/zammad,monotek/zammad,zammad/zammad,zammad/zammad,zammad/zammad,zammad/zammad,monotek/zammad,monotek/zammad