toc {
  position:fixed;
  top:0; 
  left:0; 
  width:12em; 
  height:100%;
  border-right: 1px solid black;
  background-color: #CCE6F3;
  font-family: Arial;
  scrolling: auto;
  color: darkblue;
}

toc title {
  font-size:12pt;
  font-weight: bold;
  background-color: black;
  color:white;
}

level1 {
   display: block;
   list-style-position: inside;
   font-size:12pt;
   font-weight:bold;
   margin-left: 4px;
   margin-bottom: 2px;
   cursor: pointer;
}

level2 {
   display: block;
   list-style-position: inside;
   font-size:12pt;
   margin-left: 8px;
   margin-bottom: 2px;
   cursor: pointer;
}

level3 {
   display: list-item;
   list-style-position: outside;
   list-style-type: square;
   font-size: 10pt;
   margin-left: 16px;
   margin-bottom: 2px;
   cursor: pointer;
}

toc img {
   margin-right: 1em;
}