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<html lang="en"><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"> <script src="https://cdn.jsdelivr.net/npm/jquery@3.7.1/dist/jquery.slim.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script></head><body><div class="container-fluid"> <h2>Nested Columns</h2> <p>Add columns inside other columns:</p></div><div class="container-fluid"> <div class="row"> <div class="col-8 bg-warning p-4"> .col-8 <div class="row"> <div class="col-6 bg-light p-3">.col-6</div> <div class="col-6 bg-secondary p-3">.col-6</div> </div> </div> <div class="col-4 bg-success p-4">.col-4</div>