<!DOCTYPE html>
<html>
<head>
    <title>Responsive Design with Bootstrap</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>
<body>
    <div class="container">
        <div class="row">
            <div class="col-sm-6">Column 1</div>
            <div class="col-sm-6">Column 2</div>
        </div>
    </div>
</body>
</html>
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