#calendar-section {
    text-align: center;
    padding: 20px;
}

#calendar-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

#calendar-table th, #calendar-table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: center;
    cursor: pointer;
}

#calendar-table td {
    height: 50px;
    width: 50px;
}

#calendar-table td:hover {
    background-color: #f1f1f1;
}

.selected-date {
    background-color: #007bff;
    color: #fff;
}

#cycle-length {
    padding: 10px;
    margin-bottom: 20px;
    font-size: 16px;
}

#calculate-btn {
    padding: 10px 20px;
    background-color: #007bff;
    color: #fff;
    border: none;
    cursor: pointer;
}

#calculate-btn:hover {
    background-color: #0056b3;
}

#result {
    margin-top: 20px;
    font-size: 18px;
    color: green;
}