Nested layout in rails

_layout.html.haml

-# This file contains the 'layout' for this section of the site
%section.how-it-works-page.content-section
  .container
    .row
      .col-md-12
        %h2.section-title How It Works
    .sub-nav.row
      .col-sm-3
        = active_link_to how_we_find_kids_path, class: 'link-wrap' do
          .img.school
          %span How we find kids
      .col-sm-3
        = active_link_to our_laptops_path, class: 'link-wrap' do
          .img.laptop
          %span Our laptops
      .col-sm-3
        = active_link_to reporting_to_donors_path, class: 'link-wrap' do
          .img.report
          %span Reporting to donors
      .col-sm-3
        = active_link_to why_this_matters_path, class: 'link-wrap' do
          .img.heart
          %span Why this matters

#how-it-works-content
  .container
    .row
      .col-md-12
        = yield

application.html.haml

-# the layout used throughout the site
!!!
%html
  %head
    = yield :experiment
    %title
      - if Rails.env.development?
        (dev)
      = @page_title || 'Codestarter.org: Laptops for kids'
    = stylesheet_link_tag    '//fonts.googleapis.com/css?family=Roboto:400,700,500,900,300,100,300italic|Roboto+Slab:400,300,700,100|Indie+Flower'
    = stylesheet_link_tag    'application', :media => 'all'
    = csrf_meta_tags
    %link(rel="icon" type="image/png" href="/favicon.png")
    %link(rel="image_src" type="image/png" href="#{image_url('logo.png')}")
    %meta(http-equiv="X-UA-Compatible" content="IE=edge")
    %meta(name="viewport" content="width=device-width, initial-scale=1")
    %meta(name="title" content="Codestarter.org")
    %meta(name="description" content="At Codestarter, we want to ensure that every child has the opportunity to learn how to code. And it all starts with having a computer.")
    = render 'application/js_analytics'

  %body(class="#{body_class}")
    #wrapper
      -#= render 'application/admin_status' if admin?
      = render 'application/flash'
      = render 'shared/header'
      .content= yield

      = render 'shared/footer'
    = javascript_include_tag 'application'

our_laptops.html.haml

-# using the 'how it works' layout to wrap this pages content
= render layout: 'how_it_works/layout' do
  %p our laptops...