<div>
  <button type="button" class="btn" phx-click={show_modal()}>
    Open modal
  </button>
  <.modal title="Payment succesful" icon="fa fa-check" theme={:default}>
    <:body>Thanks for your money!</:body>
  </.modal>
</div>

<div>
  <button type="button" class="btn" phx-click={show_modal()}>
    Open modal
  </button>
  <.modal title="Payment succesful" icon="fa fa-check" theme={:default}>
    <:body>Thanks for your money!</:body>
    <:button>
      <button type="button" class="btn">
        Cancel
      </button>
    </:button>
    <:button>
      <button type="button" class="btn">
        OK
      </button>
    </:button>
  </.modal>
</div>