doctype html
html(lang='en')
  head
    meta(charset='utf-8')
    meta(name='viewport', content='width=device-width, initial-scale=1')
    title #{title}
    link(rel='stylesheet', href='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css')
    block head

  body
    block content

doctype html
html(lang='en')
  head
    meta(charset='utf-8')
    meta(name='viewport', content='width=device-width, initial-scale=1')
    title #{title}
    link(rel='stylesheet', href='https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.2/css/bootstrap.min.css')
    block head

  body
    block content

Use Cloudflare CDN for Bootstrap
Use Cloudflare CDN for Bootstrap
