#main_container {
  margin: auto;
  width: 700px;
}

#calendar {
  display: grid;
  grid-template-columns: auto auto auto auto auto auto auto;
}

#title {
  font-size: 2em;
}

.day {
  aspect-ratio: 1 / 1;
  background-color: white;
  border: 1px solid black;
  padding: 5px;
}

.saturday {
  background-color: #F0FFF0;
}

.sunday {
  background-color: #FFF0F0;
}