<style type="text/css">iframe {
    border: none;
    width: 100%;
    height: 1200px;
  }
</style>
<p><iframe height="200" id="iframe-cas-mortuary-fee-widget" src="https://static.dx.principal.cl/cas-mortuary-fee-widget/1/index_sitio_publico.html" title="Solicitud cuota mortuoria" width="300"></iframe></p>