img {
  border:0px;
}
.centered {
  width:750px;
  height:586px;
  position:absolute;
  top:50%; left:50%;
  margin-left:-375px;
  margin-top:-293px;
}

#header {
  width:750px;
  height:140px;
}

#left, #right {
  float:left;
}