body {
background: #6699CC url(images/page_skybg.gif) repeat-x fixed bottom;
font-family: "lucida grande", verdana;
}

h1 {
font-size: 2.0em;
}

h2 {
font-size: 1.6em;
}

h3 {
font-size: 1.2em;
}

.content {
border: solid 1px;
padding: 2%;
width: 800px;
margin-left: auto;
margin-right: auto;
background-color: #ffffff;
}

/*
<div class='header'>
The em size unit is recommended by the W3C.

1em is equal to the current font size. The default text size in browsers is 16px. So, the default size of 1em is 16px.
*/