"When pixels failed before, we turned to ems. Repeating the logic gives us the following styles:
body {
font-size:100%;
line-height:1.125em; /* 16×1.125=18 */
}
.bodytext p {
font-size:0.875em;
}
.sidenote {
font-size:0.75em;
}"
The basic rule is: 10һ15 words per line. For liquid layouts, at 100% font size, 50% column width (in relation to window size) is a good benchmark for most screen resolutions.