body {
    font-family: Arial, sans-serif;
    padding: 20px;
    text-align: center;
    background-color: #f9f9f9;
}

.result-box {
    border: 1px solid #999;
    padding: 20px;
    display: inline-block;
    margin-top: 20px;
    background-color: #fff;
    box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

button {
    margin-top: 10px;
    padding: 6px 12px;
    cursor: pointer;
}