<!DOCTYPE html>
<meta charset="utf-8" />
<title>Element partially hidden by other element</title>

<style>
  div {
    height: 100px;
    width: 100px;
  }

  #partial {
    background: yellow;
  }

  #other {
    background: blue;
    margin-top: -50px;
    margin-left: 50px;
  }
</style>

<div id="partial"></div>
<div id="other"></div>