One Method to upgrade CSS compatibility for Jekyll to adpat all sorts of browsers.

Gemfile

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gem "autoprefixer-rails"

group :jekyll_plugins do
  gem 'jekyll-assets'
end

Add _config.yml

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assets:
  compress:
    css:  sass
    js:   uglifier
  autoprefixer:
    browsers:
        - "last 5 versions"
        - "IE > 9"
  plugins:
    css: { autoprefixer: {}}

Run in Terminal

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bundle install
bundle exec jekyll build