* {
margin:0;
padding:0;
}

html, body {
height: 100%;
width: 100%;
}

#abstand {height: 50%;
          margin-bottom: -14em;
          width: 1px;
          float: left;}

#content {height: 5em;
          clear: left;
          position: relative;
          width: 20em;
          margin: 0 auto;}