#resDiv {
  width: 100%;
  height: 246px;
  background-image: url('../images/800/resMain.jpg');
  background-repeat: no-repeat;
  font-family: arial;
}
#comDiv {
  width: 100%;
  height: 246px;
  background-image: url('../images/800/comMain.jpg');
  background-repeat: no-repeat;
  font-family: arial;
}
#diffDiv {
  width: 100%;
  height: 246px;
  background-image: url('../images/800/diffMain.jpg');
  background-repeat: no-repeat;
  font-family: arial;
}
#mainDiv {
  width: 100%;
  height: 246px;
  background-image: url('../images/800/mainMain.jpg');
  background-repeat: no-repeat;
  font-size: 18px;
  font-family: arial;
}