.main div.maincal {
  padding: 3px 6px 3px 3px;
  float: left;
  margin: 3px 3px 3px 20px;
  width: 300px;
  height: 270px;

  background-color: silver;
  display: grid;
  grid-template-columns: auto 1fr 1fr 1fr 1fr 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr;
  border-radius: 5px;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
    "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
}

@media (400px <= width <= 1000px) {
  .main div.maincal {
    margin: 2px 2px 2px 14px;
    width: 170px;
    height: 165px;
  }
}

.main div {
  padding: 3px;
  margin: 2px;
  text-align: center;
  vertical-align: middle;
}

.day {
  padding: 3px;
  margin: 2px;

  background-color: silver;
  color: black;
  display: inline;
  text-align: center;
  vertical-align: middle;
  border-radius: 4px;
  position: relative;
}

.day .vor,
.day .nach {
  position: absolute;
  height: 50%;
  width: 100%;
  left: 0px;
  padding: 0px;
  margin: 0px;
  background-color: green;
}

.day.active .vor,
.day.active .nach {
  background-color: green;
}

.day.active {
  background-color: green;
}

.day .vor {
  top: 0%;
  border-radius: 3px 3px 0px 0px;
  background-color: grey;
}

.day .nach {
  bottom: 0%;
  border-radius: 0px 0px 3px 3px;
  background-color: grey;
}

.day .title {
  z-index: 1;
  color: white;
  padding: 0px;
  margin: 0px;
  position: relative;
  background-color: none;
  vertical-align: middle;
  text-align: center;
  font-weight: bold;
}

.day.active .nach.belegt,
.day.active .vor.belegt {
  background-color: red;
  color: white;
}

.monat {
  padding: 7px;
  margin: 0px;
  grid-area: 1/1 / 1/9;
  background-color: darkgreen;
  color: white;
  text-align: center;
  display: inline;
  vertical-align: middle;
}