CSS makes repetitive tagging easier, so start out with something simple that will save time – Formatting Text – but do it properly and use ‘ems’.

body { font-size:62.5%}     /* Reduce DEFAULT font size */
h1 {font-size:2em;}           /* font displayed at 24px */
h2 {font-size:1.5em;}         /* font displayed at 18px */
h3 {font-size:1.25em;}       /* font displayed at 15px */
h4 {font-size:1em;}           /* font displayed at 12px */
p, a, li, {font-size:1em;}     /* font displayed at 12px */