.calendar {
  border: solid black 2px;
}

.calendar th {
  border: solid black 1px;
  background: #eee;
  padding: 2px;
}


.calendar td {
  padding-top: 1px;
  padding-left: 2px;
  padding-right: 2px;
  width: 70px;
  height: 70px;
  text-align: left;
  vertical-align: top;
  border: solid black 1px;
  background: #ccc;
}

.calendar td.thisday {
  background: #eee;
}

.calendar td.prevmonth {
  background: #666;
}

.calendar td.nextmonth {
  background: #666;
}

.tooltip {
  position: absolute;
  top: 0.5em;
  left: 1em;
  border: solid black 2px;
  display: none;
  background: #cc3;
  padding: 2px;
  white-space: nowrap;
}