<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link rel = stylesheet href = https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css>
<script src = https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js></script>
<script src = https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js></script>
</head>
<body>
<p>Click below if you want to kNow the warning message:</p>
<button type = button class=btn btn-warning>Warning</button>
<p>Click below if you want to kNow the result:</p>
<button type=button class = btn btn-primary btn-sm>Result</button>
</body>
</html>
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