html,body {height:100%;} .wrapper2 {width:80%;height:100%;margin:0 auto;background:#CCC} .h_iframe {position:relative;} .h_iframe .ratio {display:block;width:100%;height:auto;} .h_iframe iframe {position:absolute;top:0;left:0;width:100%; height:100%;}

Please scale the "result" window to notice the effect.

brocomfrCARBON NEUTRAL bmb-logo