#calendar {
    margin: 40px 10px;
    padding: 0;
    font-family: Arial, Helvetica Neue, Helvetica, sans-serif;
    font-size: 14px;
  }

  #calendar {
    max-width: 1100px;
    margin: 0 auto;
  }

  .fc-daygrid a {
    text-decoration: none !important;
  }

  /* カレンダー ツールチップ表示 */

  .fc-daygrid-event-harness #fct_tooltip {
    position: absolute;
    padding: 2px;
    bottom: 100%;
    margin-bottom: 10%;
    background-color: #fff3ad;
    z-index: 20;
  }
  /* 三角アイコン - 左右の中心 */
  .fc-daygrid-event-harness #fct_tooltip::before {
    content: '';
    position: absolute;
    display: block;
    width: 0;
    height: 0;
    left: 0;
    right: 0;
    bottom: -15px;
    margin: 0 auto;
    border-top: 15px solid #fff3ad;
    border-right: 15px solid transparent;
    border-left: 15px solid transparent;
  }