didnt affect tag h

my h1,h2,h3,h4,h5,h6 didnt get effect with the script?did i do wrong?

`<script src="js/flowtype.js"></script>
    <script>
      $('body').flowtype({
       minimum   : 300,
       maximum   : 780,
       minFont   : 8,
       maxFont   : 32,
       fontRatio : 60
    });
    </script>`

when i minimize my h1 font size still 32px from bootstrap.min.css
