#bigflags {
  width: 640px;
  height: 280px;
  position: absolute;
  left: 50%;
  top: 50%;
  margin: -140px 0 0 -320px;
 }
 #bigflags table {
  margin: 0 auto;
 }
 #bigflags td {
  width: 150px;
 }
 #intro {
  width: 640px;
  height: 500px;
  position: absolute;
  left: 50%;
  top: 50%;
  margin: -250px 0 0 -320px;
 }