Remove "centre" class

app/assets/stylesheets/base.css.scss

@@ -24,10 +24,6 @@ body {
   padding-top: 30px;
 }
 
-.centre {
-  text-align: center;
-}
-
 .ios-web-app {
   padding-top: 1em;
 }

app/views/settings/_export.haml

@@ -15,11 +15,11 @@
       is done.
     - if current_user.can_export?
       %form{action: begin_user_export_path, method: 'POST'}
-        %p.centre
+        %p.text-center
           %button#export-btn.btn.btn-lg.btn-primary{type: :submit} Export
         = hidden_field_tag :authenticity_token, form_authenticity_token
     - else
-      %p.centre
+      %p.text-center
         %button.btn.btn-lg.btn-primary.disabled{disabled: :disabled} Export
     %p
       - if current_user.export_url.nil?

app/views/shared/_links.html.haml

@@ -1,4 +1,4 @@
-.centre.text-muted.links
+.text-center.text-muted.links
   ©
   = Date.today.year
   = APP_CONFIG['site_name']