If you want to use Poltio Embeds in your site and if you want all the Poltio Embeds resize automatically depending on the available space you can use our Resize JavaScript SDK by adding
<script type="text/javascript" src="//sdk.poltio.com/prod/resizer.js" defer></script> in your template. Adding this tag only once will allow us to resize our Embed iframes depending on the available space after the page load event.
All the necessary calculations done in our iframes and this is a non-blocking code.