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Embed external iframe - Mobile resolution problem

I wonder if I can embed a form without scrollbars

This is my site: Contacto

It is working OK on mobile but on desktop I see the frame on the right and the horizontal scroll

Following this post Need help designing embed component to fit height of viewport

I have this code for embedding:

.iframe-holder {

width: 100%;
height: 100%;
-webkit-overflow-scrolling: touch;
  overflow-y: scroll;
.iframe-holder iframe {
  height: 100vh;
  width: 100%;

<div class="iframe-holder"><iframe src="" seamless frameborder="0"></iframe></div>

Thank you very much in advance

Here is my site Read-Only: LINK
(how to share your site Read-Only link)