.flaps_error{
  color:red;
}

/* ----- alert_box ----- */
.alert_box {
  display: none;
}

.alert_box .bg_box {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 10;
  width: 100%;
  height: 100%;
  background: #000000;
  opacity: 0.5;
  filter: alpha(opacity=50);
}