Renamed apply_inline_css to style_message as suggested

app/helpers/notifier_helper.rb

@@ -19,7 +19,7 @@ module NotifierHelper
     )
   end
 
-  def apply_inline_css(html)
+  def style_message(html)
     html.gsub /<p>/, '<p style="color: black; margin: 0.75em 0">'
   end
 end

app/views/layouts/notifier.html.erb

@@ -24,7 +24,7 @@
                 <table style="background-color: #fff; color: #222; border: solid 1px #ccc; border-collapse: separate">
                   <tr>
                     <td style="text-align: left; padding: 0px 15px 5px 15px">
-                      <%= raw apply_inline_css(yield) %>
+                      <%= raw style_message(yield) %>
                     </td>
                   </tr>
                 </table>