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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="../lib/w3.css">
<body>

<form class="w3-container w3-card-4">

<p>
<input class="w3-radio" type="radio" name="gender" value="male" checked>
<label class="w3-validate">Male</label></p>

<p>
<input class="w3-radio" type="radio" name="gender" value="female">
<label class="w3-validate">Female</label></p>

<p>
<input class="w3-radio" type="radio" name="gender" value="" disabled>
<label class="w3-validate">Don't know (Disabled)</label></p>

</form>

</body>
</html>