body {
  font-family: Arial, sans-serif;
  padding: 2em;
  background: #fff;
}
#calendar {
  max-width: 900px;
  margin: 0 auto;
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 1em;
  background: #fefefe;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.fc-event {
  background-color: #d9534f;  /* Rot für Belegt */
  border: none;
  font-size: 0.85em;
  padding: 2px 4px;
  border-radius: 3px;
}