<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Figure</title>
<style type="text/css">
body {display: flex; justify-content: center;}
.arena {display: grid;
	grid-template-columns: 300px 200px;
	background: linear-gradient(to top,goldenrod,skyblue);
	padding: 50px 100px;
}
img {height: 200px;}
img {mix-blend-mode: difference;}
p.alone {isolation: isolate;}
</style>
</head>
<body>

<div class="arena">

<p class="alone"><img src="i/diamond.png"></p>
<p><img src="i/diamond.png"></p>

</div>

</bo