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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>Align Items Start</h2>
  <p>Use the .align-items-*-start classes to align single rows of items from the start on different screens.</p>
  <p>Resize the browser window to see the effect. <strong>Note:</strong> align-items-stretch is default.</p>
  <p><code>.align-items-start</code>:</p>
  <div class="d-flex align-items-start bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>
  <p><code>.align-items-sm-start</code>:</p>
  <div class="d-flex align-items-sm-start bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>