.siew-iframe-wrapper {
  width: 100%;
  display: block;
}

.siew-iframe-wrapper iframe {
  display: block;
  max-width: 100%;
}

/* Hide scrollbars on the iframe element itself (browser-dependent) */
.siew-iframe-wrapper.siew-hide-scrollbars iframe {
  overflow: hidden;
}

/* Some browsers may still show internal scrollbars due to cross-domain content.
   This CSS cannot modify styles inside the embedded page. */