body {
    font-family: Arial, sans-serif;
  }
  
  #calendar {
    max-width: 400px;
    margin: 0 auto;
  }
  
  .calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
  }
  
  .calendar-header button {
    cursor: pointer;
    background: none;
    border: none;
    font-size: 16px;
  }
  
  .calendar-table {
    width: 100%;
    border-collapse: collapse;
  }
  
  .calendar-table th,
  .calendar-table td {
    border: 1px solid #ccc;
    padding: 10px;
    text-align: center;
  }
  
  .calendar-table th {
    background-color: #f2f2f2;
  }
  .tooltip {
    position: absolute;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 5px;
    border-radius: 5px;
    pointer-events: none;
    z-index: 1000;
  }
  .remarkable {
    background-color: lightblue; /* Adjust as needed */
  }