lk | adds some bottom padding to the nav links on bike edit form

app/views/bikes/edit.html.haml

@@ -5,12 +5,13 @@
     .col-sm-3.col-sm-offset-3
       =button_to "Mark as sold", {action: "mark_as_sold", id: @bike.id}, method: :patch, class: "btn btn-default"
   = render 'edit_form'
-  - if @next_bike
-    = link_to 'Next Bike', edit_bike_path(@next_bike)
-  - else
-    = link_to 'New Bike', new_bike_path
-  |
-  = link_to 'All Bikes', bikes_path
-  - if @previous_bike
+  .bottom-nav-links
+    - if @next_bike
+      = link_to 'Next Bike', edit_bike_path(@next_bike)
+    - else
+      = link_to 'New Bike', new_bike_path
     |
-    = link_to 'Previous Bike', edit_bike_path(@previous_bike)
+    = link_to 'All Bikes', bikes_path
+    - if @previous_bike
+      |
+      = link_to 'Previous Bike', edit_bike_path(@previous_bike)