body {
    font-family: sans-serif;
    padding: 20px;
    background: #111;
    color: #eee;
}
form {
    margin-bottom: 20px;
}
input, button {
    padding: 8px;
    font-size: 16px;
}
pre {
    background: #222;
    padding: 10px;
    border-radius: 5px;
    max-height: 400px;
    overflow: auto;
}