<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css"
    integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
</head>

<body>
  <div class="container">
    <div class="row">
      <div class="col-4 bg-primary">Hello World!</div>
      <div class="col-8 bg-danger">Hello World!</div>
    </div>
  </div>
</body>

</html>

External CSS

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External JavaScript

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