body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #fafafa;
    color: #333;
}

.container {
    max-width: 700px;
    margin: 60px auto;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1 {
    margin-top: 0;
}

.preview {
    margin-top: 20px;
    max-width: 100%;
    border-radius: 8px;
}