Extract helper

app/helpers/cards_helper.rb

@@ -40,4 +40,10 @@ module CardsHelper
     tag.meta(property: "og:image", content: @card.image.attached? ? "#{request.base_url}#{url_for(@card.image)}" : "#{request.base_url}/app-icon.png") +
     tag.meta(property: "og:url", content: card_url(@card))
   end
+
+  def button_to_remove_card_image(card)
+    button_to(card_image_path(card), method: :delete, class: "btn", data: { controller: "tooltip" }) do
+      icon_tag("trash") + tag.span("Remove background image", class: "for-screen-reader")
+    end
+  end
 end

app/views/cards/show.html.erb

@@ -21,11 +21,6 @@
   <%= render "cards/messages",  card: @card if @card.published? || @card.drafted? %>
 
   <%= render "layouts/lightbox" do %>
-    <% if @card.image.attached? %>
-      <%= button_to card_image_path(@card), method: :delete, class: "btn", data: { controller: "tooltip" } do %>
-        <%= icon_tag "trash" %>
-        <span class="for-screen-reader">Remove background image</span>
-      <% end %>
-    <% end %>
+    <%= button_to_remove_card_image(@card) if @card.image.attached? %>
   <% end %>
 </div>