It uses whenever's gem
You can set whenever's schedule according to your needs. As of now for this basic project, it currently scrapes once a day at 11 am.
The code is in config/schedule' page
every 1.day, :at => '11:00am' do runner "RedditScrapper.scrape", :environment => "development" end
Please note that this webscraping project is for "educational" value as Reddit offers its own API. Please always check the site's TOS for their take on webscraping, and/or if they offer an API. This is not a project meant for production value at all. It is meant to learn about Nokogiri, and webscraping. That's all.
Here is the front's page screenshot:
In regards to CSS, this app uses milligram's css framework