<!DOCTYPE html>
<meta name="viewport" content="width=device-width,minimum-scale=0.5,user-scalable=no">
<style>
  html {
    overflow: hidden;
  }
  body {
    margin: 0;
  }
  div {
    position: absolute;
  }
</style>
<div style="background: red; width: 300%; height: 300%"></div>
<div style="background: green; width: 200%; height: 200%"></div>
<div style="background: blue; width: 100%; height: 100%"></div>