body {
    font-family: Arial, sans-serif;
    max-width: 700px;
    margin: 40px auto;
    padding: 20px;
}

input, textarea, button {
    width: 100%;
    box-sizing: border-box;
    margin-top: 10px;
    padding: 12px;
    font-size: 16px;
}

button {
    cursor: pointer;
}

pre {
    background: #f5f5f5;
    padding: 15px;
    overflow: auto;
}