body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    padding-top: 30px;
}

.box {
    border: 1px solid #4a7bb0;
    padding: 20px 30px;
    width: 320px;
    text-align: center;
}

h3 {
    margin-top: 0;
    font-size: 18px;
}

.input-group {
    margin-bottom: 10px;
}

.input-group label {
    font-size: 14px;
}

.input-group input {
    width: 200px;
    padding: 3px;
}

button {
    margin-bottom: 15px;
    padding: 2px 10px;
    cursor: pointer;
}

#result {
    text-align: left;
    font-size: 14px;
    line-height: 1.4;
    padding-left: 60px;
}