Fix capybara on linux ubuntu

Otherwise, it appears fullscreen

spec/spec_helper.rb

@@ -39,13 +39,18 @@ Capybara.register_driver :chrome do |app|
 end
 
 Capybara.register_driver :headless_chrome do |app|
+  options = Selenium::WebDriver::Chrome::Options.new
+  options.add_argument('--headless')
+  options.add_argument('--window-size=1440,900')
+
   capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
     chromeOptions: { args: ['headless', 'disable-dev-shm-usage', 'disable-software-rasterizer', 'mute-audio', 'window-size=1440,900'] }
   )
 
   Capybara::Selenium::Driver.new app,
     browser: :chrome,
-    desired_capabilities: capabilities
+    desired_capabilities: capabilities,
+    options: options
 end
 
 # FIXME: remove this line when https://github.com/rspec/rspec-rails/issues/1897 has been fixed