<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
.container {
width: 150px;
height: 150px;
position: relative;
margin: 30px;
}
.box {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
opacity: 0.7;
background: #0057e3;
}
.overlay {
z-index: 9;
margin: 30px;
background: #009938;
}
</style>
</head>
<body>
<div class="container">
<div class="box"></div>
<div class="box overlay"></div>
</div>
</body>
</html>