.toc-nav {
   position: relative;
   border-left: 1px solid #ddd;
}

.toc-nav,.toc-nav li {
    position: relative;
    margin: 0;
    padding:3px 0px;;
    list-style: none;
    white-space: nowrap;
}

.toc-nav li:before {
    position: absolute;
    top: 6px;
    left: -5px;
    display: inline-block;
    width: 10px;
    height: 10px;
    content: '';
    border-radius: 50%;
    background-color: #fff;
}

.toc-nav li:hover:before{
  background-color: #37b1f3;
}

.toc-nav {
  position: absolute;
  top:0;
}

.toc-nav li a {
    display: inline-table;
    margin-left: 20px;
    white-space: nowrap;
    color: #333;
    text-decoration: none;
}


.toc-nav li.active:before {
    background-color: #37b1f3;
    width: 18px;
    height: 18px;
    border: 4px solid #cbeff9   ;
    position: absolute;
    left: -9px;
    top: 6px;
}