html, body {
  margin: 0;
}
#leftcol {
  float: left;
  width: 250px;
}
#main {
  margin: 0px;
}
#centercol {
  border: #f00 1px solid;
  margin: 0 265px 0 265px;
}
#rightcol {
  float: right;
  width: 250px;
}