body {
    font-family: Arial, sans-serif;
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
    line-height: 1.6;
}
h1 {
    border-bottom: 2px solid #333;
    padding-bottom: 10px;
}
h2 {
    margin-top: 30px;
    color: #444;
}
h3 {
    margin-top: 20px;
    color: #666;
}
pre {
    background-color: #f4f4f4;
    border: 1px solid #ddd;
    padding: 15px;
    overflow-x: auto;
}
code {
    font-family: monospace;
}
img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
    border: 1px solid #ddd;
}
ul {
    margin: 15px 0;
}
li {
    margin: 8px 0;
}