packages/fxa-content-server/app/scripts/templates/pair/supp.mustache

<div id="main-content" class="card">
  <section>
    <div class="error {{#error}}visible{{/error}}">{{ error }}</div>
    <div class="success"></div>

    {{^error}}
    <div class="spinner"></div>
    {{/error}}
  </section>
</div>