.calendar-container {
  text-align: center;
  width: 800px;
  height: 600px;
  border: 0px;
  margin-left: auto;
  margin-right: auto;
  border:solid 1px #777;
}

.calendar-container > iframe {
  width: 800px;
  height: 600px;
}

@media (max-width: 820px) {
  .calendar-container {
    width: 650px;
    height: 600px;
  }

  .calendar-container > iframe {
    width: 650px;
    height: 600px;
  }
}

@media (max-width: 670px) {
  .calendar-container {
    width: 550px;
    height: 600px;
  }

  .calendar-container > iframe {
    width: 550px;
    height: 600px;
  }
}

@media (max-width: 570px) {
  .calendar-container {
    width: 380px;
    height: 600px;
  }

  .calendar-container > iframe {
    width: 380px;
    height: 600px;
  }
}