index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Main Project 2</title>
  </head>
  <style media="screen">
    ul li{
      margin-top: 80px;
      margin-bottom: 80px;
    }
    div{
      width: 100px;
      height: 150px;
      background-color: green;
      position: absolute;
      margin-left: 150px;
    }
    .floor1{
      bottom: 60px;
    }
    .floor2{
      bottom: 166px;
    }
    .floor3{
      bottom: 266px;
    }
    .floor4{
      bottom: 366px;
    }
    .floor5{
      bottom: 466px;
    }
  </style>
  <body>
    <ul>
      <li>5 floor</li>
      <li>4 floor</li>
      <li>3 floor</li>
      <li>2 floor</li>
      <li>1 floor</li>
    </ul>
    <div class="floor1">

    </div>
  </body>
  <script src="script/app.js" charset="utf-8"></script>
</html>