<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
div {
border: 2px solid #CCCCCC;
}
.original-img {
width: 500px;
height: 330px;
margin-bottom: 20px;
background: url("https://images.unsplash.com/photo-1522204538344-922f76ecc041?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60") no-repeat center center;
}
.square {
background: url("https://images.unsplash.com/photo-1522204538344-922f76ecc041?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60") 50% 50% no-repeat;
width: 300px;
height: 300px;
}
.square:hover {
opacity: 0.5;
}
</style>
</head>
<body>
<div class="original-img"></div>
<div class="square"></div>
</body>
</html>