<!DOCTYPE html>
<html>
<head>
<style>
body {
font-size: 16px;
}
</style>
</head>
<body>
<p style="border: .1em solid #000;">Test 1</p>
<p style="border: .2em solid #000;">Test 2</p>
<p style="border: .3em solid #000;">Test 3</p>
</body>
</html>