<!doctype html>
<style>
  * {
      margin: 0;
      padding: 0;
  }

  html {
      background: teal;
  }

  div {
      position: absolute;
      top: 600px;
      left: 600px;
      height: 100px;
      width: 100px;
      background: transparent;
  }
</style>
<div></div>
