body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}
.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
input, button {
    margin: 10px 0;
    padding: 10px;
    width: 100%;
}
button {
    background-color: #007BFF;
    color: #fff;
    border: none;
    border-radius: 5px;
}
button:hover {
    background-color: #0056b3;
}
#result {
    margin-top: 20px;
    font-size: 1.2em;
}