#col_1 {
  text-align: center;
}
#col_2 {
  float: right;
}

#col_1.accom_reserv {
  width: 250px;
}

#col_2.accom_reserv {
  width: 425px;
}

#col_2.accom_reserv #main {
  width: 425px;
}