Replace prepend-left-20 in admin/hooks

app/views/admin/hooks/_form.html.haml

@@ -18,28 +18,28 @@
 
     .gl-mt-3
       = form.check_box :repository_update_events, class: 'float-left'
-      .prepend-left-20
+      .gl-ml-6
         = form.label :repository_update_events, class: 'list-label' do
           %strong Repository update events
         %p.light
           This URL will be triggered when repository is updated
     %li
       = form.check_box :push_events, class: 'float-left'
-      .prepend-left-20
+      .gl-ml-6
         = form.label :push_events, class: 'list-label' do
           %strong Push events
         %p.light
           This URL will be triggered for each branch updated to the repository
     %li
       = form.check_box :tag_push_events, class: 'float-left'
-      .prepend-left-20
+      .gl-ml-6
         = form.label :tag_push_events, class: 'list-label' do
           %strong Tag push events
         %p.light
           This URL will be triggered when a new tag is pushed to the repository
     %li
       = form.check_box :merge_requests_events, class: 'float-left'
-      .prepend-left-20
+      .gl-ml-6
         = form.label :merge_requests_events, class: 'list-label' do
           %strong Merge request events
         %p.light