SELINAP.COM

First reset 1em to 10px for the whole page.

body {
	font-size: 62.5%; /* Resets 1em to 10px */
}

Finally, set the font size for a section, such as the content.

#content {
	font-size: 1.6em;
	line-height: 1.6em;
}

1.6em is equal to 16px.

The line-height is the distance between lines.