Improve styling of closed registrations message, rename button (#6695)

* Improve styling of closed registrations message, rename button

"Sign up on another server"

Fix #6683

* Adjust styling of closed registrations message

app/javascript/styles/mastodon/about.scss

@@ -194,6 +194,28 @@ $small-breakpoint: 960px;
     }
   }
 
+  .closed-registrations-message {
+    margin-top: 20px;
+
+    &,
+    p {
+      text-align: center;
+      font-size: 12px;
+      line-height: 18px;
+      color: $ui-primary-color;
+      margin-bottom: 0;
+
+      a {
+        color: $ui-highlight-color;
+        text-decoration: underline;
+      }
+    }
+
+    p:last-child {
+      margin-bottom: 0;
+    }
+  }
+
   em {
     display: inline;
     margin: 0;

app/views/about/_forms.html.haml

@@ -1,12 +1,13 @@
 - if @instance_presenter.open_registrations
   = render 'registration'
 - else
-  - if @instance_presenter.closed_registrations_message.blank?
-    %p= t('about.closed_registrations')
-  - else
-    = @instance_presenter.closed_registrations_message.html_safe
+  = link_to t('auth.register_elsewhere'), 'https://joinmastodon.org', class: 'button button-primary'
 
-  = link_to t('auth.register'), 'https://joinmastodon.org', class: 'button button-primary'
+  .closed-registrations-message
+    - if @instance_presenter.closed_registrations_message.blank?
+      %p= t('about.closed_registrations')
+    - else
+      = @instance_presenter.closed_registrations_message.html_safe
 
 .separator-or
   %span= t('auth.or')