body {
  font-family: 'calibri';
  display: flex;
  flex-direction: column;
  align-items: center;
}

ul {
  padding: 0;
}
li {
  list-style-type: none;
}

header {
  display: grid;
  width: 70%;
  grid-template-columns: repeat(10, 1fr);
  grid-template-rows: 200px;
}

header section {
  grid-column: 1/11;
  grid-row: 1;
  width: 100%;
  display: flex;
  justify-content: center;
  flex-direction: column;
  align-items: center;
}

.month {
  font-size: 2.5em;
}

.info {
  grid-column: 8/11;
  width: 100%;
  grid-row: 1;
  text-align: right;
  display: flex;
  flex-direction: column;
  justify-content: center;
  font-size: 1.4em;
}

h2,h3,h4 {
  margin: 0;
}

.days {
  width: 70%;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}

.calendar {
  padding: 0;
  width: 70%;
  height: 70vh;
  display: grid;
  grid-template-columns: repeat(7, minmax(30px, 1fr));
  gap: 5px 5px;
}

.calendar__displayName {
  font-size: 1.2em;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0;
}

.short {
  display: none;
  text-decoration: none;
}

.calendar__day {
  cursor: pointer;
  background-color: gray;
  border: 1px black solid;
  padding: 10px;
  font-size: 1em;
  font-weight: 500;
}

.hidden {
  visibility: hidden;
}

.weekend {
  opacity: 70%;
  cursor: not-allowed;
}

.office {
  background-color: #00ff00;
}

.vacation {
  background-color: blue;
}

@media screen and (max-width: 768px) {
  header {
    width: 100%;
    grid-template-rows: 170px;
  }
  header section {
    grid-column: 1/5;
    align-items: start;
  }
  .short {
    display: inline;
  }
  .long {
    display: none;
  }
  .days {
    width: 100%;
  }
  .info {
    grid-column: 6/11;
    width: 100%;
  }
  .calendar {
    width: 100%;
    gap: 0;
  }
  .calendar__day {
    border: 0 solid black;
  }
}