Resize browser window with Capybara Selenium

capybara_selenium_resize_window.rb

# Resize selenium browser window to avoid Selenium::WebDriver::Error::MoveTargetOutOfBoundsError errors
#
# Example usage with Rspec (in spec/support/spec_helper.rb):
#     
#   config.before(:each) do
#     set_selenium_window_size(1250, 800) if Capybara.current_driver == :selenium
#   end
#
def set_selenium_window_size(width, height)
  window = Capybara.current_session.current_window.resize_to
  window.resize_to(width, height)
end

doesn't work with capybara 3.90
I get the error

C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/capybara-3.9.0/lib/capybara/rack_test/driver.rb:18:in `initialize': rack-test requires a rack application, but none was given (ArgumentError)

opt_fox = Selenium::WebDriver::Firefox::Options.new
opt_fox.add_argument('--width=1024') #your preferred size
opt_fox.add_argument('--height=700') #your preferred size

Capybara.register_driver :firefox do |app|
Capybara::Selenium::Driver.new(app, browser: :firefox, options: opt_fox)
end

For firefox,
Will leave it here, maybe someone in need too,
or, maybe someone can make it better,