.kalender_tag_cb {
  appearance: none;
  -moz-appearance: none;
  -webkit-appearance: none;
  outline: 6px solid black;
  box-shadow: none;
  width: 25px;
  height: 25px;
  margin: 4px;
  opacity: 1;
  content: none;
}

.kalender_tag_cb:checked {
  appearance: none;
  -moz-appearance: none;
  -webkit-appearance: none;
  outline: 6px solid red;
  width: 25px;
  height: 25px;
  opacity: 1;
  content: none;
}

.kalender_tag {
  position: absolute;
  width: 30px;
  height: 30px;
  background-color: white;
  border: 1px solid black;
}

.kalender_tag_bg {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  background-color: white;
  pointer-events: none;
}

div.div_kalender {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: black;
  background-color: rgba(0, 0, 0, 0.4);
}

div.div_kalender_inhalt {
  left: 40%;
  top: 40%;
  position: fixed;
  padding: 6px;
  background-color: #EEEFFC;
  -webkit-box-shadow: 2px 2px 5px 3px rgba(0, 0, 0, 0.5);
  -moz-box-shadow: 2px 2px 5px 3px rgba(0, 0, 0, 0.5);
  box-shadow: 2px 2px 5px 3px rgba(0, 0, 0, 0.5);
  border: 1px solid #888;
  text-align: center;
}

div.div_kalender_aktiv {
  display: block;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: black;
  background-color: rgba(0, 0, 0, 0.4);
}

tr.zeile_kalender_tage {
  background-color: #EEEFFC;
}