Bề rộng outline
<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {
border: 1px solid black;
outline-style: solid;
outline-color: red;
outline-width: thin;
}
p.ex2 {
border: 1px solid black;
outline-style: solid;
outline-color: red;
outline-width: medium;
}
p.ex3 {
border: 1px solid black;
outline-style: solid;
outline-color: red;
outline-width: thick;
}
p.ex4 {
border: 1px solid black;
outline-style: solid;
outline-color: red;
outline-width: 4px;
}
</style>
</head>
<body>
<h2>The outline-width Property</h2>
<p class="ex1">A thin outline.</p>
<p class="ex2">A medium outline.</p>
<p class="ex3">A thick outline.</p>
<p class="ex4">A 4px thick outline.</p>
</body>
</html>
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