hugo-theme-stack/layouts/_partials/comments/provider/cusdis.html

{{- $host := .Site.Params.comments.cusdis.host -}}
<div id="cusdis_thread" data-host="{{ $host }}" data-app-id="{{ .Site.Params.comments.cusdis.id }}"
    data-page-id="{{ .File.UniqueID }}" data-page-url="{{ .Permalink }}" data-page-title="{{ .Title }}"></div>
<script async defer src="{{ $host }}/js/cusdis.es.js"></script>

<script>
    function setCusdisTheme(theme) {
        let cusdis = document.querySelector('#cusdis_thread iframe');
        if (cusdis) {
            window.CUSDIS.setTheme(theme);
            cusdis.contentWindow.document.body.style.backgroundColor = window.getComputedStyle(document.body).backgroundColor;
        }
    }
    window.addEventListener('load', function () {
        let iframe = document.querySelector("#cusdis_thread iframe");
        if (iframe) {
            let observer = new MutationObserver(() => {
                let scrollHeight = iframe.contentWindow.document.body.scrollHeight;
                iframe.style.height = scrollHeight + "px";
            });
            observer.observe(iframe.contentWindow.document.body, { childList: true, subtree: true });
        }
    });
    window.addEventListener('onColorSchemeChange', (e) => {
        setCusdisTheme(e.detail)
    })
</script>