div.calendar {
  border: 1px solid black;
  background: #ffffff;
  position: absolute;
  z-index: 10;
}
div.calendar span.year_month {
  width: 12em;
  display: inline-block;
  text-align: center;
}
div.calendar table {
  width: 100%;
}
div.calendar td{
  width: 14.2857%;
  text-align: center;
  cursor: pointer;
}
div.calendar td.wrong_month {
  color: #707070;
}
div.calendar td.chosen_date {
  color: #ffffff;
  background: #000000;
}
div.calendar div.time div {
  display: inline-block;
}
div.calendar div.time div input {
  width: 3em;
  display: block;
  text-align: center;
}