Apply banner style to the new banners

Banner sections can be saved (one banner can appear in several sections)
If the hex color is changed in the textfield, the color of the color picker changes.

app/controllers/admin/banners_controller.rb

@@ -40,8 +40,9 @@ class Admin::BannersController < Admin::BaseController
 
     def banner_params
       attributes = [:title, :description, :target_url, :style, :image,
-                    :post_started_at, :post_ended_at, :sections,
-                    :background_color, :font_color]
+                    :post_started_at, :post_ended_at,
+                    :background_color, :font_color,
+                    web_section_ids: []]
       params.require(:banner).permit(*attributes)
     end
 
@@ -58,6 +59,6 @@ class Admin::BannersController < Admin::BaseController
     end
 
     def banner_sections
-      @banner_sections = Banner::Section.sections.map {|banner_section| [banner_section[1], banner_section[0]]} # name, value
+      @banner_sections = WebSection.all
     end
 end