<!-- Blend a background image and a background color specifying background-size in percentage  -->
<!DOCTYPE HTML>
<html>
<head>
<style>
div { 
	background-color: #777777;
	background-size: 50% 50%;
	width: 200px;
	height: 200px;
	margin: 10px;
}
</style>
</head>

<body>
    <div></div>
</body>
</html>