a {text-decoration:none}
a:visited {color:#00f}
a.level1 {font-size:100%}
a.level2 {
  font-size:90%;
  position:relative;
  left:10px;
  margin-right:10px}
a.level3 {
  font-size:80%;
  position:relative;
  left:20px;
  margin-right:20px}
math {text-align:left}
math.ss {font-family:sans-serif}