html, body
{
  height: 100%;
}

body
{
  text-align: center;
}

#distance
{
  float: left;
  height: 50%;
  margin-bottom: -300px;
  width: 1px;
}

#container
{
  clear: left;
  width: 800px;
  height: 600px;
  margin: 0 auto;
  position: relative;
}