body {
    font-family: Arial, sans-serif;
    margin: 20px;
}
h1 {
    color: #333;
}
form {
    margin-bottom: 20px;
}
input[type="text"] {
    padding: 10px;
    margin-right: 10px;
}
input[type="submit"] {
    padding: 10px;
}
#resultado {
    margin-top: 20px;
    font-weight: bold;
}