<!DOCTYPE html>

<html>
<head>
    <style type="text/css">
      .content {
        background-color: silver;
        height: 200px;
        width: 1000px;
        margin: 5px;
      }
      
      .fixed {
        position: fixed;
        width: 50%;
        background-color: rgba(0, 128, 0, 0.8);
      }
    </style>
</head>
<body>

<div class="content"></div>
<div class="fixed content"></div>
<div class="content" style="margin-top: 210px"></div>
<div class="content"></div>
<div class="content"></div>
<div class="content"></div>
<div class="content"></div>
<div class="content"></div>
<div class="content"></div>
<div class="content"></div>

</body>
</html>
