website/static/css/auto_toc.css

#content {
    counter-reset: heading;
}

#content h2:not(.toc):before {
    content: counter(heading)") ";
    counter-increment: heading;
}

#content h2:not(.toc) {
    counter-reset: subheading;
}

#content h3:not(.toc):before {
    content: counter(heading)"." counter(subheading)") ";
    counter-increment: subheading;
}

#content h3:not(.toc) {
    counter-reset: subsubheading;
}

#content h4:not(.toc):before {
    content: counter(heading)"." counter(subheading)"." counter(subsubheading)") ";
    counter-increment: subsubheading;
}

#toc {
    float: right;
    width: fit-content;
    font-size: smaller;
    padding: 0 0.5em;
    border-width: 2px;
    border-style: solid;
    border-radius: 10px;
    max-height: 50vh;
    overflow: auto;
}

#toc_wrap {
    display: none;
}

@media (min-width: 1000px) {
    #toc_wrap {
        display: block;
        float: right;
        position: sticky;
        max-width: 12%;
        top: 1em;
    }
}

@media (min-height: 750px) {
    #toc_wrap {
        top: 8em;
    }
}

@media (min-width: 1500px) {
    #toc_wrap {
        right: 100px;
    }
}

#toc ul, .toc {
    margin: 0.25em 0;
}

#toc ul {
    padding-left: 1em;
}