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<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
  <style>
  /* Note: Try to remove the following lines to see the effect of CSS positioning */
  .affix {
    top: 0;
    width: 100%;
    z-index: 9999 !important;
  }
  .affix + .container-fluid {
    padding-top: 70px;
  }
  </style>
</head>
<body>
<div class="container-fluid" style="background-color:#F44336;color:#fff;height:200px;">