body {
    font-family: Arial, sans-serif;
}

.datepicker {
    position: relative;
    display: inline-block;
}

#dateInput {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.calendar {
    position: absolute;
    top: 40px;
    left: 0;
    background: white;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.hidden {
    display: none;
}

.day {
    display: inline-block;
    width: 30px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    margin: 2px;
    cursor: pointer;
}

.day:hover {
    background-color: #f0f0f0;
}