Bulma is-primary

<!DOCTYPE html>
<html>

  <head>
    <link data-require="bulma@*" data-semver="0.5.2" rel="stylesheet" href="https://unpkg.com/bulma@0.5.2/css/bulma.css" />
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
    <style type="text/css" media="all">
      body{padding: 20px;}
    </style>
  </head>

  <body>
    Bulma Button with is-primary class<br />
    <a class="button is-primary">
      ButtonText
    </a>
  </body>

</html>

// Code goes here

/* Styles go here */