h1   { font-weight: bold; font-size: 24px }
h2   { font-weight: bold; font-size: 20px }
h3   { font-weight: bold; font-size: 18px }
h4   { font-weight: normal; font-size: 14px }
h5  { font-weight: lighter; font-size: 12px }
h6 { font-weight: lighter; font-size: 10px }