Screenshot the viewport with Ruby and Puppeteer

Install Puppeteer and Grover

npm i puppeteer
gem install grover

Take a screenshot of the viewport and save to file

require 'grover'

File.open("viewport.png", "wb") do |f|
  f.write(Grover.new('https://www.bbc.co.uk/news/business-63709754').to_png)
end

Find out how to change the size of the viewport with Ruby and Puppeteer.