diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 00000000..c5f500dd
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,20 @@
+# git
+.git
+.gitignore
+README.md
+
+# Rails
+.env
+.env.prod
+*.rbc
+capybara-*.html
+.rspec
+log
+tmp
+/db/**/*.sqlite3
+/db/**/*.sqlite3-journal
+public/system
+coverage/
+spec/tmp
+.rvmrc
+scripts/
diff --git a/app/views/landing/meetings.html.erb b/app/views/landing/meetings.html.erb
index c2033119..10c10c24 100644
--- a/app/views/landing/meetings.html.erb
+++ b/app/views/landing/meetings.html.erb
@@ -22,12 +22,14 @@
 
     <%= render 'shared/title', title: t('start_new_session') %>
 
-    <%= render layout: 'shared/center_panel' do %>
-      <div class="center-block col-sm-8">
-        <%= render 'shared/meeting_url', hidden: false %>
-        <%= render 'shared/join_form' %>
-      </div>
-    <% end %>
+    <div class="center-panel-wrapper">
+      <%= render layout: 'shared/center_panel' do %>
+        <div class="center-block col-sm-8">
+          <%= render 'shared/meeting_url', hidden: false %>
+          <%= render 'shared/join_form' %>
+        </div>
+      <% end %>
+    </div>
 
   </div>
 </div>
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 6f2ca454..7b2ebfbc 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -63,9 +63,11 @@ Rails.application.configure do
   # Set this to true and configure the email server for immediate delivery to raise delivery errors.
   # config.action_mailer.raise_delivery_errors = false
 
-  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
-  # the I18n.default_locale when a translation cannot be found).
-  config.i18n.fallbacks = true
+  # action cable socket URI
+  config.action_cable.url = "ws://#{ENV['HOSTNAME']}/cable" # TODO this should use WSS protocol
+
+  # allowed action cable origins
+  config.action_cable.allowed_request_origins = ["https://#{ENV['HOSTNAME']}", "http://#{ENV['HOSTNAME']}"]
 
   # Send deprecation notices to registered listeners.
   config.active_support.deprecation = :notify
diff --git a/config/puma.rb b/config/puma.rb
index c7f311f8..c5d935d1 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -9,7 +9,7 @@ threads threads_count, threads_count
 
 # Specifies the `port` that Puma will listen on to receive requests, default is 3000.
 #
-port        ENV.fetch("PORT") { 3000 }
+port        ENV.fetch("PORT") { 9292 }
 
 # Specifies the `environment` that Puma will run in.
 #
diff --git a/docker-compose.yml b/docker-compose.yml
index 48f53d1c..92621a65 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,7 +6,6 @@ services:
       - '80:80'
     volumes:
       - '.:/usr/src/app'
-      - '~/.ssh:/root/.ssh/'
     volumes_from:
       - gem_cache
     expose:
diff --git a/sample.env b/sample.env
index f01527a4..d9dbc21f 100644
--- a/sample.env
+++ b/sample.env
@@ -14,4 +14,5 @@ GOOGLE_OAUTH2_ID=
 GOOGLE_OAUTH2_SECRET=
 
 # For production
-SECRET_KEY_BASE=
\ No newline at end of file
+SECRET_KEY_BASE=
+HOSTNAME=