body {
    font-family: Arial, sans-serif;
    background: #f6f6f6;
    padding: 24px;
}
h1 {
    margin-bottom: 12px;
}
textarea {
    width: 100%;
    height: 140px;
    padding: 10px;
    margin-bottom: 12px;
}
button {
    background: #e53935;
    color: #fff;
    border: none;
    padding: 10px 18px;
    cursor: pointer;
}
pre {
    background: #fff;
    padding: 12px;
    margin-top: 12px;
    min-height: 60px;
}