#kasten_links {
float:left;
margin:0;
padding:0;
width:20%;
}

#container {
margin-left:800px
}

#kasten_rechts {
float:right;
margin:0;
padding:0;
width:20%;
}


<!-- überschreiben von basemond.css  -->

  #header {
    color:#FFE8FF;
    background:#FFE8FF repeat-x top left;
    padding:45px 2em 1em 20px;
  }

  #topnav { color:#FFE8FF; background:transparent; }

  /* (en) adjustment of main navigation */
  /* (de) Anpassung der Hauptnavigation */
  #nav ul { margin-left:20px; }

  #main { background:#FFE8FF;padding:10px 0; }

  #footer {
    color:#FFE8FF;
    background:#FFE8FF;
    padding:10px 20px;
    border-top:5px #efefef solid;
    line-height:1.5em;
  }

  #page {  color:#FFE8FF;
    background:#FFE8FF;
  }

  hr {
    color:#FFE8FF;
    background:transparent;
     border-bottom:1px #FFE8FF solid;
  }