BODY {  background-color : ffffff; font-family: Arial, Helvetica, sans-serif}

H1 {
  font-family: Arial, Helvetica, sans-serif;
  font-style: normal;
  font-weight: bold;
  font-size: 150%;
  color: #336699;
  margin-bottom: 20px
}

H2 {
  font-family: Arial, Helvetica, sans-serif;
  font-style: oblique;
  font-weight: bold;
  font-size: 120%;
  color: #336699;
  margin-bottom: 0px
; padding-top: 10px}

H3 {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 100%;
  color: #336699;
  margin-bottom: 0px
}

strong {  font-family : Arial, Helvetica, sans-serif;
  font-variant: normal;
  font-weight: bold;
  font-size: 120%;
  color: #336699;
}


.bibliography {margin-left: 1em; text-indent: -1em}
.exercise {color: #336699; font-weight: normal}
a {  color: 336699}