Remove `.row` use prepend class for margin

app/views/admin/licenses/missing.html.haml

@@ -7,8 +7,8 @@
 %hr
 
 .container.blank-state-container
-  .row.text-center
+  .text-center
     = custom_icon("missing_license")
     %h4 You do not have a license.
     %p.trial-description You can start a free trial of GitLab Enterprise Edition without any obligation or payment details.
-    = link_to 'Start free trial', new_admin_trials_url, class: "btn btn-new btn-start-trial"
+    = link_to 'Start free trial', new_admin_trials_url, class: "btn btn-new btn-start-trial prepend-top-10"