diff --git a/docs/sidebar.yaml b/docs/sidebar.yaml
index a0bb53f4..5c0a6864 100644
--- a/docs/sidebar.yaml
+++ b/docs/sidebar.yaml
@@ -65,7 +65,7 @@
 - title: Running Locally
   link: local.html
   svg_text: |-
-    <svg fill="none" stroke="currentColor" stroke-width="1.5" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+    <svg class="w-6 h-6 text-gray-800 dark:text-white" aria-hidden="true" fill="none" stroke="currentColor" stroke-width="1.5" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
     <path stroke-linecap="round" stroke-linejoin="round" d="M9 17.25v1.007a3 3 0 01-.879 2.122L7.5 21h9l-.621-.621A3 3 0 0115 18.257V17.25m6-12V15a2.25 2.25 0 01-2.25 2.25H5.25A2.25 2.25 0 013 15V5.25m18 0A2.25 2.25 0 0018.75 3H5.25A2.25 2.25 0 003 5.25m18 0V12a2.25 2.25 0 01-2.25 2.25H5.25A2.25 2.25 0 013 12V5.25"></path>
     </svg>
 
diff --git a/nb-theme/index.html.j2 b/nb-theme/index.html.j2
index 952e9ebb..c0a0fcf2 100644
--- a/nb-theme/index.html.j2
+++ b/nb-theme/index.html.j2
@@ -116,9 +116,9 @@ a.anchor-link {
 
 {%- block body_header -%}
 {% if resources.theme == 'dark' %}
-<body class="" data-jp-theme-light="false" data-jp-theme-name="JupyterLab Dark">
+<body class="dark" data-jp-theme-light="false" data-jp-theme-name="JupyterLab Dark">
 {% else %}
-<body class="" data-jp-theme-light="true" data-jp-theme-name="JupyterLab Light">
+<body class="dark" data-jp-theme-light="true" data-jp-theme-name="JupyterLab Light">
 {% endif %}
 
         <nav class="dark bg-white border-gray-200 py-2.5 dark:bg-gray-900">
