Rails production dont show background images

My images not showed in production (link here).

My code:

_header.html.erb

<%if action_name == 'index' %>
  <div class="main_header_bg" id="main_head">
  <% end %>
   <header id='header'>
    <div class="container">
     <div class="logo">
      <%= link_to image_tag('logo.png'), root_path%>
  </div>

main.css

.main_header_bg {
background-image: url(/header_bg.jpg);
-webkit-background-size: 100% 100%;
background-size: 100% 100%;
height: 718px;

production.log

ActionController::RoutingError (No route matches [GET] "/assets/images/header_bg.jpg"):

Images directories:

1. app/assets/images/
2. public/assets/images/