html { overflow : hidden; }

body {
  padding: 0;
  margin: 0;
  overflow: hidden;
  font-family: Arial, serif;
  font-size: 95%;
}

#main {
  margin:
    -300px
    0
    0
    -318px;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 500px;
  height: 250px;
}

#c {
  position: absolute;
  bottom:0;
  right:0;
}