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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Scroll Event Navigation Example</title>
    <style>
      #navbar {
        position: fixed;
        top: 0;
        width: 100%;
        background-color: #333;
        color: white;
        text-align: center;
        padding: 10px;
        transition: top 0.3s;
      }
      body {
        padding: 0;
        margin: 0;
        height: 1500px; /* to ensure scrolling */
        font-family: Arial, sans-serif;
      }
    </style>
  </head>
  <body>
    <strong><p style="display: flex; justify-content: center; align-items: center; margin-top: 50vh;">When you scroll down, the navigation bar disappears. Scroll back up, and it reappears!</p></strong>

<div id="navbar">Navigation Bar</div>