body {
    font-family: Arial, sans-serif;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}
ul {
    list-style-type: none;
    padding: 0;
}
li {
    padding: 10px;
    background: #f4f4f4;
    margin: 5px 0;
}