body {
    font-family: 'Times New Roman', Times, serif;
    display: flex;
    justify-content: center;
    padding-top: 40px;
    background-color: #ffffff;
}

/* Khung viền ngoài màu xanh dương */
.box-container {
    border: 1.5px solid #4a7ebb;
    padding: 20px 30px;
    width: fit-content;
    min-width: 320px;
    text-align: center;
}

h2 {
    font-size: 22px;
    margin-top: 0;
    margin-bottom: 20px;
    font-weight: bold;
    color: #000000;
}

.input-group {
    margin-bottom: 12px;
    font-size: 16px;
}

.input-group label {
    font-size: 16px;
}

.input-group input {
    width: 200px;
    padding: 2px 5px;
    font-size: 14px;
    border: 1px solid #767676;
}

/* Nút bấm Statistic */
button {
    font-family: Arial, sans-serif;
    font-size: 13px;
    padding: 2px 10px;
    background-color: #f0f0f0;
    border: 1px solid #767676;
    border-radius: 2px;
    cursor: pointer;
    margin-bottom: 15px;
}

button:hover {
    background-color: #e0e0e0;
}

/* Khu vực kết quả hiển thị */
#result {
    text-align: left;
    margin-top: 5px;
}

#result p {
    font-size: 16px;
    margin: 3px 0;
    color: #000000;
}