title: The font size of GitHub page is different from the local server
body: <p>It's page on GitHub page:
  <a href="https://i.stack.imgur.com/6g1vQ.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <p>It's page on local server: 
  <a href="https://i.stack.imgur.com/gEjXN.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <p>Their font size is different.But why?</p>