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<!DOCTYPE html>
<html>
<head>
  <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>
  <style>
  #myBtn {
    width: 300px;
    padding: 10px;
    font-size:20px;
    position: absolute;
    margin: 0 auto;
    right: 0;
    left: 0;
    bottom: 50px;
    z-index: 9999;
  }
</style>
</head>
<body>
<div class="container mt-3">