Edited main.css and DeinGLF_Themen

Changed styles of add-topic-tile
Merge branch 'Dev_Files_Aileen' of https://github.com/felixmueller1989/glf_projekt into Dev_Files_Aileen

Conflicts:
	Dev/01_GLF_goes_mobile/DeinGLF_Themen.html
	Dev/01_GLF_goes_mobile/css/main.css