body {
    font-family: Arial, sans-serif;
}
.form-group {
    margin-bottom: 15px;
}
.form-group label {
    display: inline-block;
    width: 150px;
    text-align: right;
    margin-right: 10px;
}
.form-group input {
    width: 200px;
}
form {
    max-width: 400px;
    margin: auto;
}
input[type="submit"] {
    margin-left: 160px;
}
#result {
    margin-top: 20px;
    text-align: center;
}