html { 
  background: url(/bib/img/bg_sitzplatz.jpg) no-repeat center center fixed; 
  /* background: url(/vieux-chene/bib/img/bg_Aussenansicht_im_November.jpg) no-repeat center center fixed;  */
  -webkit-background-size: cover;
  -moz-background-size: cover;
	
  -o-background-size: cover;
  background-size: cover;

}