<!DOCTYPE html>
<html>
<head>
<style>
select {
width: 100%;
padding: 16px 20px;
border: none;
border-radius: 4px;
background-color: #f1f1f1;
}
</style>
</head>
<body>
<p>A styled select menu.</p>
<form>
<select id="country" name="country">
<option value="usa">Australia</option>
<option value="usa">Canada</option>
<option value="usa">USA</option>
</select>
</form>
</body>
</html>