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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 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>
  body {
    position: relative;
  }
  .affix {
    top: 20px;
    z-index: 9999 !important;
  }
  div.col-sm-9 div {
    height: 250px;
    font-size: 28px;
  }
  #section1 {color: #fff; background-color: #1E88E5;}
  #section2 {color: #fff; background-color: #673ab7;}
  #section3 {color: #fff; background-color: #ff9800;}
  #section41 {color: #fff; background-color: #00bcd4;}
  #section42 {color: #fff; background-color: #009688;}
  
  @media screen and (max-width: 810px) {