diff --git a/README.md b/README.md
index 60a9c9c8..be67d64b 100644
--- a/README.md
+++ b/README.md
@@ -133,6 +133,9 @@ Fill in the environment variables
 Install this project with:
 ```sh
   bundle install
+  yarn install --frozen-lockfile
+  yarn build:css
+  gem install foreman
   rails db:create db:migrate db:seed
 ```
 
@@ -145,6 +148,11 @@ To run the project, execute the following command:
 ```
 Open `http://localhost:3000/` on your browser.
 
+`bin/dev` builds the stylesheet, then runs Rails, the CSS watcher, and Sidekiq
+using `Procfile.dev`. Node.js, Yarn, and Foreman must be installed.
+If you start Rails directly with `bin/rails server`, run `yarn build:css` first
+and use `yarn build:css --watch` in another terminal while editing styles.
+
 ### Run tests
 
 To run tests, run the following command:
diff --git a/app/assets/images/addisu.jpeg b/app/assets/images/addisu.jpeg
new file mode 100644
index 00000000..76427535
Binary files /dev/null and b/app/assets/images/addisu.jpeg differ
diff --git a/app/assets/images/arturo.jpeg b/app/assets/images/arturo.jpeg
new file mode 100644
index 00000000..d83e3c1f
Binary files /dev/null and b/app/assets/images/arturo.jpeg differ
diff --git a/app/assets/images/brenda.jpeg b/app/assets/images/brenda.jpeg
new file mode 100644
index 00000000..c73e0102
Binary files /dev/null and b/app/assets/images/brenda.jpeg differ
diff --git a/app/assets/images/darik.jpg b/app/assets/images/darik.jpg
new file mode 100755
index 00000000..102f5539
Binary files /dev/null and b/app/assets/images/darik.jpg differ
diff --git a/app/assets/images/david.jpg b/app/assets/images/david.jpg
new file mode 100755
index 00000000..337c7e86
Binary files /dev/null and b/app/assets/images/david.jpg differ
diff --git a/app/assets/images/elson.jpeg b/app/assets/images/elson.jpeg
new file mode 100644
index 00000000..7653c9e5
Binary files /dev/null and b/app/assets/images/elson.jpeg differ
diff --git a/app/assets/images/gabriel.jpg b/app/assets/images/gabriel.jpg
new file mode 100755
index 00000000..992ed7df
Binary files /dev/null and b/app/assets/images/gabriel.jpg differ
diff --git a/app/assets/images/jesus.jpg b/app/assets/images/jesus.jpg
new file mode 100755
index 00000000..44e68bf3
Binary files /dev/null and b/app/assets/images/jesus.jpg differ
diff --git a/app/assets/images/santo.jpeg b/app/assets/images/santo.jpeg
new file mode 100644
index 00000000..6726058a
Binary files /dev/null and b/app/assets/images/santo.jpeg differ
diff --git a/app/assets/images/tinashe.jpeg b/app/assets/images/tinashe.jpeg
new file mode 100644
index 00000000..fddef885
Binary files /dev/null and b/app/assets/images/tinashe.jpeg differ
diff --git a/app/assets/images/worash.jpg b/app/assets/images/worash.jpg
new file mode 100755
index 00000000..0a92fafe
Binary files /dev/null and b/app/assets/images/worash.jpg differ
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 5286a5f7..371ae20f 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -8,7 +8,7 @@ def current_user
   end
 
   def current_visitor
-    session[:visitor_id] ? Visitor.find(session[:visitor_id]) : create_current_visitor
+    Visitor.find_by(id: session[:visitor_id]) || create_current_visitor
   end
 
   def posts_per_page
diff --git a/bin/dev b/bin/dev
index 5f91c205..f33a1912 100755
--- a/bin/dev
+++ b/bin/dev
@@ -1,2 +1,6 @@
 #!/usr/bin/env ruby
-exec "./bin/rails", "server", *ARGV
+Dir.chdir(File.expand_path("..", __dir__)) do
+  # Build once before Rails starts so the first request has a stylesheet.
+  system("yarn", "build:css", exception: true)
+  exec "foreman", "start", "-f", "Procfile.dev", *ARGV
+end
diff --git a/bin/setup b/bin/setup
index be3db3c0..708da830 100755
--- a/bin/setup
+++ b/bin/setup
@@ -15,6 +15,10 @@ FileUtils.chdir APP_ROOT do
   puts "== Installing dependencies =="
   system("bundle check") || system!("bundle install")
 
+  puts "\n== Installing and building stylesheets =="
+  system! "yarn install --frozen-lockfile"
+  system! "yarn build:css"
+
   # puts "\n== Copying sample files =="
   # unless File.exist?("config/database.yml")
   #   FileUtils.cp "config/database.yml.sample", "config/database.yml"
diff --git a/db/seeds.rb b/db/seeds.rb
index 9e503879..0a0d9c3c 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -7,17 +7,31 @@
 #   Character.create(name: 'Luke', movie: movies.first)
 
 unless Member.any?
-  Member.create!(name: 'Elson', bio: 'Student from Brazil', email: 'elson@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'Worash', bio: 'Student from Ethiopia', email: 'worash@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'Jesus', bio: 'Student from Mexico', email: 'jesus@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'Darik', bio: 'Student from Ethiopia', email: 'darik@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'Gabriel', bio: 'Student from Brazil', email: 'gabriel@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'David', bio: 'Student from Ecuador', email: 'david@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'Brenda', bio: 'Student from Rwanda', email: 'brenda@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'Addisu', bio: 'Student from Ethiopia', email: 'addisu@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'Tinashe', bio: 'Student from Zimbabwe', email: 'tinashe@blog.com', password: 'foobar', password_confirmation: 'foobar')
-  Member.create!(name: 'Gabriel', bio: 'Student from Brazil', email: 'santo@blog.com', password: 'foobar', password_confirmation: 'foobar')  
-  Member.create!(name: 'Arturo', bio: 'Student from Ecuador', email: 'arturo@blog.com', password: 'foobar', password_confirmation: 'foobar')
+  members = [
+    { name: 'Elson', bio: 'Student from Brazil', email: 'elson@blog.com' },
+    { name: 'Worash', bio: 'Student from Ethiopia', email: 'worash@blog.com' },
+    { name: 'Jesus', bio: 'Student from Mexico', email: 'jesus@blog.com' },
+    { name: 'Darik', bio: 'Student from Ethiopia', email: 'darik@blog.com' },
+    { name: 'Gabriel', bio: 'Student from Brazil', email: 'gabriel@blog.com' },
+    { name: 'David', bio: 'Student from Ecuador', email: 'david@blog.com' },
+    { name: 'Brenda', bio: 'Student from Rwanda', email: 'brenda@blog.com' },
+    { name: 'Addisu', bio: 'Student from Ethiopia', email: 'addisu@blog.com' },
+    { name: 'Tinashe', bio: 'Student from Zimbabwe', email: 'tinashe@blog.com' },
+    { name: 'Gabriel', bio: 'Student from Brazil', email: 'santo@blog.com' },
+    { name: 'Arturo', bio: 'Student from Ecuador', email: 'arturo@blog.com' }
+  ]
+
+  members.each do |attributes|
+    member = Member.new(attributes.merge(password: 'foobar', password_confirmation: 'foobar'))
+    email_name = member.email.split('@').first
+    avatar_path = Rails.root.join('app/assets/images').glob("#{email_name}.{jpg,jpeg,png}").first
+    raise "Avatar image not found for #{member.email}" unless avatar_path
+
+    File.open(avatar_path, 'rb') do |file|
+      member.avatar.attach(io: file, filename: avatar_path.basename.to_s)
+      member.save!
+    end
+  end
 end
 
 unless Post.any?
diff --git a/spec/controllers/application_controller_spec.rb b/spec/controllers/application_controller_spec.rb
new file mode 100644
index 00000000..2437c778
--- /dev/null
+++ b/spec/controllers/application_controller_spec.rb
@@ -0,0 +1,36 @@
+require 'rails_helper'
+
+RSpec.describe ApplicationController, type: :controller do
+  describe '#current_visitor' do
+    it 'reuses the visitor stored in the session' do
+      visitor = Visitor.create!(user_agent: 'Test browser')
+      session[:visitor_id] = visitor.id
+
+      expect { expect(controller.current_visitor).to eq(visitor) }.not_to change(Visitor, :count)
+    end
+
+    it 'creates a visitor when the session has no visitor ID' do
+      request.env['HTTP_USER_AGENT'] = 'Test browser'
+
+      expect { controller.current_visitor }.to change(Visitor, :count).by(1)
+
+      visitor = Visitor.find(session[:visitor_id])
+      expect(visitor.user_agent).to eq('Test browser')
+      expect(controller.current_visitor).to eq(visitor)
+    end
+
+    it 'replaces a stale visitor ID in the session' do
+      visitor = Visitor.create!(user_agent: 'Old browser')
+      session[:visitor_id] = visitor.id
+      visitor.destroy!
+      request.env['HTTP_USER_AGENT'] = 'Test browser'
+
+      expect { controller.current_visitor }.to change(Visitor, :count).by(1)
+
+      replacement = Visitor.find(session[:visitor_id])
+      expect(replacement.id).not_to eq(visitor.id)
+      expect(replacement.user_agent).to eq('Test browser')
+      expect(controller.current_visitor).to eq(replacement)
+    end
+  end
+end