body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
    color: #222;
}
h1, h2 {
    color: #111;
}
h1 {
    margin-bottom: 10px;
}
h2 {
    margin-top: 30px;
}
p, li {
    margin-bottom: 10px;
}
ul {
    padding-left: 20px;
}
footer {
    margin-top: 40px;
    font-size: 0.9em;
    color: #555;
}