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<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 100px;
height: 100px;
display: inline-block;
}
</style>
</head>
<body>
<div style="background: rgba(0, 0, 255, 0.3); "></div>
<div style="background: rgba(0, 0, 255, 0.7); "></div>
</body>
</html>