SandpointsTheme/layouts/_default/_markup/render-heading.html

<h{{ add 1 .Level }} id="{{ .Anchor | safeURL }}" class="hx css-{{ .Page.File.UniqueID }}-h{{ add 1 .Level }}">{{ .Text | safeHTML }}<a class="hpar" href="#{{ .Anchor | safeURL }}">¶</a></h{{ add 1 .Level }}>