The below stylesheet can be very much useful in showing the iframe loaded through ajax or any 3d party API call in full height of the container.

<style>
		.iframeContainer {
		  overflow: hidden;
		  padding-top: 56.25%; /* 16:9*/
		  position: relative;
		}

		.iframeContainer  iframe {
		   border: 0;
		   height: 100%;
		   left: 0;
		   position: absolute;
		   top: 0;
		   width: 100%;
		}
	</style>