Assuming iframe is required, the following 2 results were found.
So this is a quick article to demo how to center an iframe horizontally and vertically in a screen/viewport in pure CSS (no JavaScript allowed). This CSS centers it by its center point rather than the top/bottom/left/right outline. Why? On a mobile, a...
Then this shows how to embed using a DIV layer which allows for CSS styling. The last part shows how to embed using an IFRAME tag which isn't great for CSS styling as you can't do cross-dom acoss child iframes; but it does let you use OpenURL(v_Url,...