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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 href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body> 
<div class="container mt-3">
  <h2>Align Self Center</h2>
  <p>Use the .align-self-*-center classes to align a flex item in the center of a flex container on different screens.</p>
  <p>Resize the browser window to see the effect. <strong>Note:</strong> align-self-stretch is default.</p>
  <p><code>.align-self-center</code>:</p>
  <div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-center">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>
  <p><code>.align-self-sm-center</code>:</p>
  <div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-sm-center">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>
  <p><code>.align-self-md-center</code>:</p>
  <div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-md-center">Flex item 2</div>