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<!DOCTYPE html>
<html>
<head>
<style>
.initial {
width: 100px;
height: 100px;
margin-bottom: 20px;
border-color: blue;
border-style: solid;
border-top-width: 6px;
border-right-width: 6px;
border-bottom-width: 6px;
border-left-width: 6px;
}
.thin {
width: 100px;
height: 100px;
margin-bottom: 20px;
border: 2px solid blue;
}
.medium {
width: 100px;
height: 100px;
margin-bottom: 20px;
border: 6px solid blue;
}
.thick {
width: 100px;
height: 100px;
margin-bottom: 20px;
border: 10px solid blue;
}
</style>
</head>
<body>
<div class="initial"></div>
<div class="thin"></div>
<div class="medium"></div>
<div class="thick"></div>
</body>
</html>