Bulma Modifiers

<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <title>Hello Bulma!</title>
      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
      <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.6.0/css/bulma.min.css">
   </head>
   <body>
      <section class="section">
         <div class="container">
            <a class="button is-danger is-outlined">
            Button
            </a>
            <a class="button is-danger is-loading">
            Button
            </a>
            <a class="button is-danger is-disabled" disabled>
            Button
            </a>
         </div>
      </section>
   </body>
</html>