Update button styles in _details.html.haml

app/views/clusters/clusters/_details.html.haml

@@ -4,7 +4,7 @@
   %section.settings.no-animate{ class: ('expanded' if expanded) }
     .settings-header
       %h4= s_('ClusterIntegration|Provider details')
-      %button.btn.js-settings-toggle{ type: 'button' }
+      %button.btn.gl-button.js-settings-toggle{ type: 'button' }
         = expanded ? _('Collapse') : _('Expand')
       %p= s_('ClusterIntegration|See and edit the details for your Kubernetes cluster')
     .settings-content