set iframe height and width by js
#IFRAME_ID {
width: 100%!important;
height: 100%!important;
}
<iframe src="http://www.youraddress.com" id="IFRAME_ID"></iframe>
#####################
If still not working you can try solution from on the solutions from the link
https://stackoverflow.com/questions/819416/adjust-width-and-height-of-iframe-to-fit-with-content-in-itiframe 100 height of content
<script>
function resizeIframe(obj) {
obj.style.height = obj.contentWindow.document.documentElement.scrollHeight + 'px';
}
</script>Copyright © 2021 Codeinu
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