#calendar {
    width: 100%;
    margin-top: 20px;
    padding: 15px;
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#calendar .month {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.2em;
    font-weight: bold;
    color: #08415c;
}

#calendar .weekdays {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    color: #08415c;
    font-weight: bold;
}

#calendar .weekdays .weekday {
    flex: 1;
    text-align: center;
    border-bottom: 2px solid #08415c;
    padding-bottom: 5px;
}

#calendar .days {
    display: flex;
    flex-wrap: wrap;
    border-top: 1px solid #dee2e6;
}

#calendar .day {
    width: calc(100% / 7);
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-right: 1px solid #dee2e6;
    border-bottom: 1px solid #dee2e6;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
    font-size: 1.1em;
    color: #08415c;
    background-color: #fff;
}

#calendar .day:hover {
    background-color: #08415c;
    color: white;
}

#calendar .day.today {
    background-color: #08415c;
    color: white;
    font-weight: bold;
    border: 2px solid #05688a;
    box-shadow: 0 0 5px #05688a;
}

#calendar .day.empty {
    background-color: #f8f9fa;
    border: none;
    cursor: default;
}