Iframe Auto Height, stretch out content, so only one scrollbar

I want to embedd another website within my blog. WI have limited control over the other embedded website layout wise, so i decided to make a blog and just embedd the other website within it

I only want one scroll bar, not 2. I am using an embed site plugin. I went to wordpress, create new page, and used the plugin shortcode to embedd a page. However the page is long, it creates a scrollbar. I want the entire page to adjust to the extra height and create only 1 scrollbar, the main browser scrollbar.

[iframe src=”URL” width=”100%” height=”100%”] is what im using. I thought height 100% would force the content/container of the page to stretch out so it only uses the browser scrollbar.

URL: Link