Widget:EmbedZoom

zoom: 0.8; -moz-transform: scale(0.5); -moz-transform-origin: 0 0; -o-transform: scale(0.5); -o-transform-origin: 0 0; -webkit-transform: scale(0.5); -webkit-transform-origin: 0 0; }
 * 1) wrapper { width: 2000px; height: 3000px; padding: 0; overflow: hidden; }
 * 2) scaled-frame { width: 1000px; height: 1500px; border: 1px solid lightgrey; }
 * 3) scaled-frame {

@media screen and (-webkit-min-device-pixel-ratio:0) { } 
 * 1) scaled-frame { zoom: 1;  }

Reference
https://collaboration133.com/how-to-scale-iframe-content-in-ie-chrome-firefox-and-safari/2717/