<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>CSS Masking: mask-position: position mask layer image</title> <link rel="author" title="Astley Chen" href="mailto:aschen@mozilla.com"> <link rel="author" title="Mozilla" href="https://www.mozilla.org"> <style type="text/css"> .outer { border: 1px solid black; width: 100px; height: 100px; } .inner { margin-left: 20px; margin-top: 50px; width: 50px; height: 50px; background-color: purple; } </style> </head> <body> <div class="outer"><div class="inner"></div></div> <div class="outer"><div class="inner"></div></div> <div class="outer"><div class="inner"></div></div> <div class="outer"><div class="inner"></div></div> </body> </html>