html { font-size: 100%; }
h1 { font-size: 2rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.2rem; }
small { font-size: 0.8rem; }

body {
    width: 80%;
    margin: auto;
    font-family: sans-serif;
    line-height: 1.4em;
}

h1 {
    margin-top: 40px;
    margin-bottom: 20px;
    line-height: 1em;
}

h2 {
    color: #666;
    margin-top: 20px;
    margin-bottom: 20px;
    line-height: 1.2em;
}