diff --git a/growing-systems-of-permanence/index.html b/growing-systems-of-permanence/index.html
index 25bff9a..567a78b 100644
--- a/growing-systems-of-permanence/index.html
+++ b/growing-systems-of-permanence/index.html
@@ -60,12 +60,14 @@
     var thread_uri = window.location.href;
     var thread_title = window.document.title;
     var thread_fragment = window.location.hash;
-  
+
     // rb owner was here.
-    var rb_src = "https://my.remarkbox.com/embed" + 
+    var mode_param = "&mode=dark";
+    var rb_src = "https://my.remarkbox.com/embed" +
         "?rb_owner_key=" + rb_owner_key +
         "&thread_title=" + encodeURI(thread_title) +
-        "&thread_uri=" + encodeURIComponent(thread_uri) + 
+        "&thread_uri=" + encodeURIComponent(thread_uri) +
+        mode_param +
         thread_fragment;
   
     function create_remarkbox_iframe() {
diff --git a/let-us-define-a-permacomputer/index.html b/let-us-define-a-permacomputer/index.html
index ecc01a9..70ab9b4 100644
--- a/let-us-define-a-permacomputer/index.html
+++ b/let-us-define-a-permacomputer/index.html
@@ -241,10 +241,12 @@ something, you are likely clicking a link!
   var thread_title = window.document.title;
   var thread_fragment = window.location.hash;
 
-  var rb_src = "https://my.remarkbox.com/embed" + 
+  var mode_param = "&mode=dark";
+  var rb_src = "https://my.remarkbox.com/embed" +
       "?rb_owner_key=" + rb_owner_key +
       "&thread_title=" + encodeURI(thread_title) +
-      "&thread_uri=" + encodeURIComponent(thread_uri) + 
+      "&thread_uri=" + encodeURIComponent(thread_uri) +
+      mode_param +
       thread_fragment;
 
   function create_remarkbox_iframe() {