Cobalah sendiri - CSS outline-width

<!DOCTYPE html>
<html>
<head>
<style>
p {border: 1px solid black;}

p.one {
   outline-style: double;
   outline-color: red;
   outline-width: thick;
}

p.two {
   outline-style: double;
   outline-color: green;
   outline-width: 3px;
}
</style>
</head>
<body>

<h2>The outline-width Property</h2>

<p class="one">This is some text.</p>
<p class="two">This is some text.</p>
<b>Note:</b> IE8 supports the outline properties only if a !DOCTYPE is specified.

</body>
</html>