<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Responsive Page with Bootstrap</title>
  <!-- Bootstrap CSS -->
  <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet">
  <style>
    /* Centering the content */
    body {
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100vh;
      margin: 0;
    }

    /* Styling the results box */
    #results-box {
      margin-top: 20px;
    }
  </style>
</head>
<body>

<div class="container">
  <div class="row">
    <div class="col-md-6 offset-md-3">
      <!-- Search Bar -->
      <input type="text" class="form-control" id="searchInput" placeholder="Type something and press Enter">

      <!-- Results Box -->
      <div id="results-box" class="mt-3"></div>
    </div>
  </div>
</div>

<!-- Bootstrap JS and Popper.js (required for Bootstrap) -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.6/dist/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script>

<!-- Custom JavaScript for handling the search -->
<script>
  document.getElementById('searchInput').addEventListener('keyup', function (event) {
    if (event.key === 'Enter') {
      handleSearch();
    }
  });

  function handleSearch() {
    var searchInput = document.getElementById('searchInput');
    var searchTerm = searchInput.value;

    if (searchTerm.trim() !== '') {
      // Append result to the results box
      var resultsBox = document.getElementById('results-box');
      resultsBox.innerHTML += '<p class="alert alert-success">Result: ' + searchTerm + '</p>';

      // Clear the search input
      searchInput.value = '';
    }
  }
</script>

</body>
</html>