diff --git a/server/templates/instances.html.j2 b/server/templates/instances.html.j2
index 4f0308f..7cb29da 100644
--- a/server/templates/instances.html.j2
+++ b/server/templates/instances.html.j2
@@ -1,6 +1,6 @@
 {# SPDX-License-Identifier: AGPL-3.0-only #}
 <!DOCTYPE html>
-<html lang="en">
+<html lang="en" data-bs-theme="dark">
   <head>
     <meta charset="utf-8">
     <link href="/static/bootstrap.min.css" rel="stylesheet">