{% macro action(label, uri, params, classes="button--primary") %}
  <form action="{{ uri }}" method="POST">
    {{ csrf_token()|safe }}

    {% for name, value in params.items() %}
      <input type="hidden" name="{{ name }}" value="{{ value }}">
    {% endfor %}

    <button class="button {{ classes }}" type="submit">{{ label }}</button>
  </form>
{% endmacro %}