diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index 47dde8c1..00000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,37 +0,0 @@
-GEM
-  remote: https://rubygems.org/
-  specs:
-    coderay (1.1.1)
-    method_source (0.8.2)
-    pry (0.10.4)
-      coderay (~> 1.1.0)
-      method_source (~> 0.8.1)
-      slop (~> 3.4)
-    puma (3.6.0)
-    rack (1.6.4)
-    rack-protection (1.5.3)
-      rack
-    rack-rewrite (1.5.1)
-    rake (11.3.0)
-    sinatra (1.4.7)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
-    sinatra-param (1.4.0)
-      sinatra (~> 1.3)
-    slop (3.6.0)
-    tilt (2.0.5)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  pry
-  puma
-  rack-rewrite
-  rake
-  sinatra
-  sinatra-param
-
-BUNDLED WITH
-   1.13.6
diff --git a/app.rb b/app.rb
index a5b7a065..5c99a3bf 100644
--- a/app.rb
+++ b/app.rb
@@ -4,12 +4,11 @@ require 'json'
 
 Bundler.require( :default, ENV[ 'RACK_ENV' ].to_sym )
 
+require_relative './options'
 require_relative './lib/ledger'
 
 # Sinatra app serving API
 class LedgerRbApp < Sinatra::Base
-  helpers Sinatra::Param
-
   before  do
     content_type :json, 'charset' => 'utf-8'
   end
@@ -24,8 +23,6 @@ class LedgerRbApp < Sinatra::Base
   end
 
   get '/api/ledger/accounts/depth/:depth/?' do
-    param :depth, Integer, required: true
-
     Ledger.accounts( params[ :depth ] ).to_json
   end
 
@@ -34,20 +31,12 @@ class LedgerRbApp < Sinatra::Base
   end
 
   get '/api/ledger/register/?' do
-    param :period, String, default: nil
-    param :categories, String, required: true
-
     { key: params[ :categories ],
       values: Ledger.register( params[ :period ], params[ :categories ] ) }
       .to_json
   end
 
   get '/api/ledger/balance/?' do
-    param :depth, Integer, default: false
-    param :period, String, default: nil
-    param :cleared, Boolean, default: false
-    param :categories, String, default: ''
-
     Ledger.balance( params[ :cleared ],
                     params[ :depth ],
                     params[ :period ],
@@ -60,17 +49,11 @@ class LedgerRbApp < Sinatra::Base
   end
 
   get '/api/ledger/budget/?' do
-    param :period, String, default: 'this month'
-    param :categories, String, required: true
-
     Ledger.budget( params[ :period ],
                    params[ :categories ] ).to_json
   end
-  
-  get '/api/ledger/graph_values/?' do
-    param :period, String, default: nil
-    param :categories, String, default: 'Expenses'
 
+  get '/api/ledger/graph_values/?' do
     Ledger.graph_values( params[:period], params[:categories].split(' ') ).to_json
   end
 
diff --git a/config.ru b/config.ru
index 604d9e61..e738e1a5 100644
--- a/config.ru
+++ b/config.ru
@@ -1,12 +1,7 @@
 # encoding: utf-8
 
-require 'bundler'
-
-require_relative './config/options'
 require_relative './app'
 
-use Rack::Rewrite do
-  rewrite %r{^/(.*(css|js|ttf|woff|html|png|jpg|jpeg|gif|ico)$)}, '/app/$1'
+map "/" do
+  run LedgerRbApp
 end
-
-run LedgerRbApp
diff --git a/config/options.rb b/config/options.rb
deleted file mode 100644
index fe84e261..00000000
--- a/config/options.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-# encoding: utf-8
-
-ENV[ 'LEDGER_FILE' ] ||= '/home/owncloud-data/cycojesus/files/org-files/comptes.ledger'
-
-CURRENCY = '€'
-SEPARATOR = ','
diff --git a/gems.locked b/gems.locked
new file mode 100644
index 00000000..6e8cc63b
--- /dev/null
+++ b/gems.locked
@@ -0,0 +1,34 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    coderay (1.1.2)
+    method_source (0.9.0)
+    mustermann (1.0.1)
+    pry (0.11.2)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    puma (3.10.0)
+    rack (2.0.3)
+    rack-protection (2.0.0)
+      rack
+    rack-rewrite (1.5.1)
+    rake (12.2.1)
+    sinatra (2.0.0)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.0)
+      tilt (~> 2.0)
+    tilt (2.0.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  pry
+  puma
+  rack-rewrite
+  rake
+  sinatra
+
+BUNDLED WITH
+   1.14.6
diff --git a/Gemfile b/gems.rb
similarity index 71%
rename from Gemfile
rename to gems.rb
index 2a5e60a0..3887f1eb 100644
--- a/Gemfile
+++ b/gems.rb
@@ -2,9 +2,7 @@
 
 source 'https://rubygems.org'
 
-gem 'rack-rewrite'
 gem 'sinatra'
-gem 'sinatra-param'
 gem 'puma'
 gem 'rake'
 gem 'pry'
diff --git a/options.rb b/options.rb
new file mode 100644
index 00000000..76ad01d9
--- /dev/null
+++ b/options.rb
@@ -0,0 +1,6 @@
+# encoding: utf-8
+
+ENV[ 'LEDGER_FILE' ] ||= '/home/nextcloud/data/cycojesus/files/org-files/comptes.ledger'
+
+CURRENCY = '€'
+SEPARATOR = ','
diff --git a/public/app/js/templates/dashboard.html b/public/app/js/templates/dashboard.html
index b73daf89..a6726cf3 100644
--- a/public/app/js/templates/dashboard.html
+++ b/public/app/js/templates/dashboard.html
@@ -10,7 +10,7 @@
                           options="graphiques.monthly_values.options"></nvd3>
                 </md-card>
         </md-card>
-        <h1>{{period | amDateFormat:'MMMM YYYY'}}</h1>
+        <h1 style="text-align: center;">{{period | amDateFormat:'MMMM YYYY'}}</h1>
         <md-card flex="100" layout="column"
                  ng:repeat="bucket in balance.buckets">
             <md-toolbar>
diff --git a/tasks/pry.rake b/tasks/pry.rake
index 7ca725fb..1ea5dc37 100644
--- a/tasks/pry.rake
+++ b/tasks/pry.rake
@@ -2,13 +2,7 @@
 
 ENV['RACK_ENV'] = 'development'
 task :load_config do
-  require 'rubygems'
-  require 'bundler'
-
-  Bundler.require( :default, ENV['RACK_ENV'].to_sym )     # require tout les gems définis dans Gemfile
-
-  require_relative '../lib/ledger'
-  require_relative '../config/options'
+  require_relative '../app'
 end
 
 desc 'Open pry with DB environment setup'