<!DOCTYPE html>
<html>
<head>
<style>
div {
font-size: 80px;
color: gray;
text-shadow: none;
stroke-color: blue;
display: inline;
}
</style>
</head>
<body>
<div style="stroke-width: 25px;">◼</div>
<div style="stroke-width: 0.2in;">◼</div>
<div style="stroke-width: 2mm;">◼</div>
<div style="stroke-width: 0.1cm;">◼</div>
<div style="stroke-width: 25px;"><span>◼</span></div>
<div style="stroke-width: 0.2in;"><span>◼</span></div>
<div style="stroke-width: 2mm;"><span>◼</span></div>
<div style="stroke-width: 0.1cm;"><span>◼</span></div>
</body>
</html>