diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..0a35d2e
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,8 @@
+FROM ruby:latest
+RUN mkdir /code
+WORKDIR /code
+ADD Gemfile /code/
+ADD . /code/
+RUN bundle install
+
+CMD bundle exec ruby main.rb
diff --git a/Gemfile b/Gemfile
index 111df68..6a51ffe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,3 +8,9 @@ gem 'color'
 gem 'excon'
 gem 'rmagick'
 gem 'json'
+gem 'matrix'
+gem 'thin'
+gem 'puma'
+gem 'reel'
+gem 'http'
+gem 'webrick'
diff --git a/main.rb b/main.rb
index 65a7403..3f531eb 100644
--- a/main.rb
+++ b/main.rb
@@ -37,7 +37,7 @@ module Excon
   end
 end
 
-BACKEND_URL = 'https://inventory.waw.hackerspace.pl/api/1/'
+BACKEND_URL = 'http://spejstore:8000/api/1/'
 CODE_PREFIX = "HTTP://I/"
 
 def api(uri)
@@ -68,9 +68,9 @@ def render_identicode(data, id, extent)
 end
 
 DYMO_LABEL_SIZE = [89, 36]
-ZEBRA_LABEL_SIZE = [100, 60]
+ZEBRA_LABEL_SIZE = [50, 30]
 
-def render_label(item_or_label_id, size: DYMO_LABEL_SIZE)
+def render_label(item_or_label_id, size: ZEBRA_LABEL_SIZE)
   item = api("items/#{item_or_label_id}")
 
   pdf = Prawn::Document.new(page_size: size.map { |x| mm2pt(x) },
@@ -131,5 +131,5 @@ post '/api/1/print/:id' do
   temp = Tempfile.new('labelmaker')
   temp.write(render_label(params["id"]))
   temp.close
-  system("lpr -P DYMO_LabelWriter_450 #{temp.path}")
+  system("echo lpr -P DYMO_LabelWriter_450 #{temp.path}")
 end