* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 20px;
    padding: 20px;
    background-color: #f9f9f9;
}
h1, h2 {
    color: #333;
}
p, li {
    color: #666;
}