body {
    font-family: sans-serif;
    background: #f6f8fa;
    display: flex;
    justify-content: center;
}
.container {
    max-width: 600px;
    margin-top: 40px;
}
input, textarea, select, button {
    display: block;
    width: 100%;
    margin-bottom: 10px;
    padding: 10px;
}
pre {
    background: #fff;
    padding: 15px;
    white-space: pre-wrap;
    border: 1px solid #ccc;
}