<!DOCTYPE html>
<html>
<head>
<title>Titre du document</title>
<style>
.example {
margin: 40px auto;
max-width: 700px;
}
input[type=submit] {
padding: .6em 1em;
font-size: 1em;
width: 100px;
margin-bottom: 1em;
}
input[type=submit]:default {
border: 4px dotted #8ebf42;
}
</style>
</head>
<body>
<h2>Exemple du sélecteur :default </h2>
<div class="example">
<form action="#">
<input type="submit" value="Oui">
<input type="submit" value="Non">
</form>
</div>
</body>
</html>