title: FLUTTER: How to set auto font size in TextSpan
body: <p>I want to implement that text with divider in between lines:
  <a href="https://i.stack.imgur.com/PGf7P.png" rel="nofollow noreferrer">Smart City Text</a></p>
  <p>Do you guys have any ideas how can I implement that in flutter? I tried few things but it is kind of a challenge for me, because I am beginner. Divider line have to be long as text above and under line.</p>