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<!DOCTYPE html>
<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 mt-3">
  <h2>Horizontal Direction</h2>
  <p>Use .flex-row to make the flex items appear side by side (default).</p>
  <p>Use .flex-sm|md|lg|xl-row to achieve this on a specific screen size. Resize the browser window to see the effect</p>
  <p><code>flex-row:</code></p>
  <div class="d-flex flex-row bg-secondary mb-3">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
  </div>
  
  <p><code>flex-sm-row:</code></p>
  <div class="d-sm-flex flex-sm-row bg-secondary mb-3">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
  </div>
  
  <p><code>flex-md-row:</code></p>
  <div class="d-md-flex flex-md-row bg-secondary mb-3">
    <div class="p-2 bg-info">Flex item 1</div>