.toc {
    position: sticky;
    top: 100px;
}
.toc ul {
    padding: 0;
    margin: 0;
}
.toc a {
    color: #999;
    font-size: 14px;
    text-decoration: none;
}
.toc .toc-h2 {
    margin-left: 10px
}
.toc .toc-h3 {
    margin-left: 20px
}
.toc li.active {
    border-left: 2px solid;
}
.toc li.active a {
    color: #434462;
    font-weight: bold;
}
.toc.right {
    right: 0
}
.toc li {
    list-style: none;
    padding: 3px 20px;
    margin-left: -2px;
}