title: How to improve "Eliminate render-blocking resources" for Lighthouse report (PWA)?
body: <p>My first attempt at a PWA is here:
  <a href="https://flowster.app/calculators/freight-class-calculator/" rel="nofollow noreferrer">https://flowster.app/calculators/freight-class-calculator/</a></p>
  
  <p>And I'm trying to get 100% in Lighthouse for all the categories :)</p>
  
  <p><a href="https://i.stack.imgur.com/9Ql9r.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9Ql9r.png" alt="enter image description here"></a></p>
  
  <p>I read the "Learn More" page but couldn't understand how to deliver Bootstrap CSS inline, for example.</p>
  
  <p>Any suggestions?</p>