diff --git a/resources/views/layouts/parts/base-body-start.blade.php b/resources/views/layouts/parts/base-body-start.blade.php
index 47119897960..d53110547d8 100644
--- a/resources/views/layouts/parts/base-body-start.blade.php
+++ b/resources/views/layouts/parts/base-body-start.blade.php
@@ -1,2 +1,39 @@
 {{-- This is a placeholder template file provided as a --}}
-{{-- convenience to users of the visual theme system. --}}
\ No newline at end of file
+{{-- convenience to users of the visual theme system. --}}
+
+<!-- Check if there's a "iframe=true" query parameter in the request -->
+@if(request()->query('iframe') === 'true')
+
+    <!-- Set styles for when we're in "iframe mode" -->
+    <!-- Most of these hide elements to provide a simple "embedded view" -->
+    <style>
+        #header,
+        #sidebar,
+        #content .button,
+        .tri-layout-right,
+        .grid.third.gap-xxl,
+        .comments-container,
+        #main-content > .mb-m,
+        .tri-layout-mobile-tabs
+        {
+            display: none
+        }
+
+        .content-wrap.card
+        {
+            margin: 0;
+            border: none;
+            box-shadow: none;
+        }
+    </style>
+
+    <!-- Add a script to control dark-mode via JavaScript -->
+    <!-- if there's also a 'theme' query paramter -->
+    @if(request()->query('theme'))
+        <script nonce="{{ $cspNonce }}">
+            // Use JavaScript to toggle the 'dark-mode' class on the HTML element to enable/disable
+            // dark mode based on whether the `theme` query parameter is 'dark'.
+            document.documentElement.classList.toggle('dark-mode', {{ request()->query('theme') === 'dark' ? 'true' : 'false' }});
+        </script>
+    @endif
+@endif