<button type="button" class="btn dso-info-button">
    <span class="sr-only">
        Toelichting
    </span>
</button>
<button type="button" class="btn dso-info-button{{#if infoOpen }} dso-open{{/if}}">
  <span class="sr-only">
    Toelichting
  </span>
</button>
/* No context defined for this component. */

De class .dso-info-open (bij getoonde toelichting) maakt de button groen.