diff --git a/_includes/comments/utterances.html b/_includes/comments/utterances.html
index afd7cd3e1..8a2b0289b 100644
--- a/_includes/comments/utterances.html
+++ b/_includes/comments/utterances.html
@@ -1,51 +1,49 @@
 <!-- https://utteranc.es/ -->
-<script src="https://utteranc.es/client.js"
-        repo="{{ site.comments.utterances.repo }}"
-        issue-term="{{ site.comments.utterances.issue_term }}"
-        crossorigin="anonymous"
-        async>
-</script>
+<script
+  src="https://utteranc.es/client.js"
+  repo="{{ site.comments.utterances.repo }}"
+  issue-term="{{ site.comments.utterances.issue_term }}"
+  crossorigin="anonymous"
+  async
+></script>
 
 <script type="text/javascript">
-  $(function() {
-    const origin = "https://utteranc.es";
-    const iframe = "iframe.utterances-frame";
-    const lightTheme = "github-light";
-    const darkTheme = "github-dark";
+  $(function () {
+    const origin = 'https://utteranc.es';
+    const iframe = 'iframe.utterances-frame';
+    const lightTheme = 'github-light';
+    const darkTheme = 'github-dark';
     let initTheme = lightTheme;
 
-    if ($("html[data-mode=dark]").length > 0
-        || ($("html[data-mode]").length == 0
-            && window.matchMedia("(prefers-color-scheme: dark)").matches)) {
+    if (
+      $('html[data-mode=dark]').length > 0 ||
+      ($('html[data-mode]').length == 0 && window.matchMedia('(prefers-color-scheme: dark)').matches)
+    ) {
       initTheme = darkTheme;
     }
 
-    addEventListener("message", (event) => {
+    addEventListener('message', (event) => {
       let theme;
 
       /* credit to <https://github.com/utterance/utterances/issues/170#issuecomment-594036347> */
       if (event.origin === origin) {
         /* page initial */
         theme = initTheme;
-
-      } else if (event.source === window && event.data &&
-            event.data.direction === ModeToggle.ID) {
+      } else if (event.source === window && event.data && event.data.direction === ModeToggle.ID) {
         /* global theme mode changed */
         const mode = event.data.message;
-        theme = (mode === ModeToggle.DARK_MODE ? darkTheme : lightTheme);
-
+        theme = mode === ModeToggle.DARK_MODE ? darkTheme : lightTheme;
       } else {
         return;
       }
 
       const message = {
-        type: "set-theme",
+        type: 'set-theme',
         theme: theme
       };
 
       const utterances = document.querySelector(iframe).contentWindow;
       utterances.postMessage(message, origin);
     });
-
   });
 </script>