hello-algo/overrides/partials/comments.html

{% if page.meta.comments %}
  <h2 id="__comments">{{ lang.t("meta.comments") }}</h2>
  <!-- Insert generated snippet here -->
  <script 
    src="https://giscus.app/client.js"
    data-repo="krahets/hello-algo"
    data-repo-id="R_kgDOIXtSqw"
    data-category="Announcements"
    data-category-id="DIC_kwDOIXtSq84CSZk_"
    data-mapping="pathname"
    data-strict="1"
    data-reactions-enabled="1"
    data-emit-metadata="0"
    data-input-position="top"
    data-theme="preferred_color_scheme"
    data-lang="zh-CN"
    crossorigin="anonymous"
    async
  >
  </script>
  <!-- Synchronize Giscus theme with palette -->
  <script>
    var giscus = document.querySelector("script[src*=giscus]")

    /* Set palette on initial load */
    var palette = __md_get("__palette")
    if (palette && typeof palette.color === "object") {
      var theme = palette.color.scheme === "slate" ? "dark_dimmed" : "light"
      giscus.setAttribute("data-theme", theme) 
    }

    /* Register event handlers after documented loaded */
    document.addEventListener("DOMContentLoaded", function() {
      var ref = document.querySelector("[data-md-component=palette]")
      ref.addEventListener("change", function() {
        var palette = __md_get("__palette")
        if (palette && typeof palette.color === "object") {
          var theme = palette.color.scheme === "slate" ? "dark_dimmed" : "light"

          /* Instruct Giscus to change theme */
          var frame = document.querySelector(".giscus-frame")
          frame.contentWindow.postMessage(
            { giscus: { setConfig: { theme } } },
            "https://giscus.app"
          )
        }
      })
    })
  </script>
{% endif %}