html {
    font-family: Helvetica, Arial, sans-serif;
    font-size: 14px;
}
body {
    width: 800px;
    margin: 0 auto;
}
p {
    font-size: 1rem;
    line-height: 1.5;
}
h1 {
    font-size: 1.5rem;
    font-weight: bold;
}
h2 {
    font-size: 1.2rem;
    font-weight: bold;
}