Fix admin-facing uses of inline CSS (#13575)

* Move .back-button inline styles to CSS file

All occurrences of the back-button CSS class used the same inline
CSS rules, so moved them over to the CSS file

* Fix “Add new domain block” button using inline CSS

* Replace common pattern of inline-styled button boxes by a CSS class

In particular, switching from `float: left/right` to a flexbox with
`justify-content: space-between`. This implied changing the order of
a few HTML tags and adding an empty `div` in one case.

Also removed a `margin-bottom` rule that wasn't needed due to the
margins of surrounding elements.

* Move account admin view inline CSS to CSS file

1 files changed, 4 insertions, 4 deletions

diff --git a/app/views/admin/pending_accounts/index.html.haml b/app/views/admin/pending_accounts/index.html.haml
index 7ce5b8213..79ae4a320 100644
--- a/app/views/admin/pending_accounts/index.html.haml
+++ b/app/views/admin/pending_accounts/index.html.haml
@@ -25,9 +25,9 @@
 
 %hr.spacer/
 
-%div{ style: 'overflow: hidden' }
-  %div{ style: 'float: right' }
-    = link_to t('admin.accounts.reject_all'), reject_all_admin_pending_accounts_path, method: :post, data: { confirm: t('admin.accounts.are_you_sure') }, class: 'button button--destructive'
-
+%div.action-buttons
   %div
     = link_to t('admin.accounts.approve_all'), approve_all_admin_pending_accounts_path, method: :post, data: { confirm: t('admin.accounts.are_you_sure') }, class: 'button'
+
+  %div
+    = link_to t('admin.accounts.reject_all'), reject_all_admin_pending_accounts_path, method: :post, data: { confirm: t('admin.accounts.are_you_sure') }, class: 'button button--destructive'