body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    width: 100%;
    max-width: 600px;
}

.card {
    background-color: #fff;
    box-shadow: 0 4px 6px 0 rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 6px;
}

h2 {
    margin-top: 0;
    text-align: center;
}

pre {
    white-space: pre-wrap;
    word-wrap: break-word;
}

button {
    background-color: #3498db;
    color: #fff;
    font-size: 1rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    display: inline-block;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #2980b9;
}

p {
    margin-top: 1rem;
}