diff --git a/instances/templates/instance.html b/instances/templates/instance.html
index 7cca6f16..03ec3851 100644
--- a/instances/templates/instance.html
+++ b/instances/templates/instance.html
@@ -69,7 +69,7 @@
             </dl>
         </div>
         <div class="card-footer p-2">
-            <ul class="nav nav-pills flex-wrap flex-lg-nowrap gap-1 small" id="navbtn" role="tablist" aria-label="{% trans "Instance actions" %}">
+            <ul class="nav nav-pills nav-fill flex-wrap flex-lg-nowrap gap-1 small" id="navbtn" role="tablist" aria-label="{% trans "Instance actions" %}">
                 {# a template is cloned, not run: no power, access, snapshots or stats #}
                 {% if not instance.is_template %}
                 <li class="nav-item" role="presentation">
diff --git a/instances/templates/instances/settings_tab.html b/instances/templates/instances/settings_tab.html
index 036cd3eb..1cc63667 100644
--- a/instances/templates/instances/settings_tab.html
+++ b/instances/templates/instances/settings_tab.html
@@ -6,7 +6,7 @@
     <!-- Nav tabs -->
     <div class="card">
     <div class="card-header bg-transparent pb-0">
-    <ul class="nav nav-underline small" role="tablist" aria-label="Instance settings">
+    <ul class="nav nav-underline nav-fill small" role="tablist" aria-label="Instance settings">
         {% if instance.guest_agent_ready %}
             <li class="nav-item" role="presentation">
                 <button class="px-1 nav-link" data-bs-toggle="tab" id="osinfo-tab" data-bs-target="#osinfo" type="button" role="tab" aria-controls="osinfo" aria-selected="false" onclick="get_osinfo();">