.calendar {
    font-family: Arial, sans-serif;
    width: 1450px;
    margin: 0 auto;
    background-color:#a9c1be; /* Màu nền của lịch */
    color: #141414;

}

.month {
    text-align: center;
    font-size: 20px;
    margin-bottom: 10px;
}

.weekdays {
    display: flex;
    background-color: #007bff;
    height: 40px;
}

.weekdays div {
    flex: 1;
    text-align: center;
    background-color: #f0f0f0;
    padding: 5px;
}

.days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    height: 650px;
}

.days div {
    border: 1px solid #ccc;
    padding: 10px;
    text-align: center;
}

.days div:nth-child(7n+1) {
    color: red; /* Chủ Nhật */
}
.controls {

    display: flex;
    align-items: center;
}

.controls-left {
    margin-right: auto;
}

.controls-right {
    margin-left: auto;
}
.checked-day {
    background-color: #4CAF50;
    color: white;
}
.tongtien
{
    text-align: right;
    font-size: 20px;
    font-weight: bold;
}