body {
  background-image:url(../hintergruende/logo_hintergundnavi-farbverlauf300x1200.jpg);    
  padding:0px; 
  margin-top: 10px;
  margin-right: 0px;
  margin-bottom: 0px;
  margin-left: 0px;
}
h1 {
  font-family: arial, verdana, sans-serif;
}
<background-color:#66CCFF;>