CSS beginner here. As you can see from the code, I want 'Introduction' and 'Contents' to be at the same distance from the top but the 'Introduction' is going down on it's own.
Here is a screenshot of the output:

Code
<!DOCTYPE html>
<html>
<head>
    <style rel="stylesheet" type="text/css">
        body {
            background: #e7e6e1;
            font-family: Georgia, 'Times New Roman';
            font-size: 16px;
            line-height: 150%;
            color: #333;
        }
        index {
            display: block;
            margin: 20px;
            font-size: 25px
        }
        h1 {
            color: #0E0B06;
            font-weight: normal;
            margin-bottom: 0px;
        }
        h2 {
            color: #0E0B06;
            font-size: 15px;
            font-weight: normal;
            margin-bottom: 0px;
        }
        a {
            color: #333;
            text-decoration: none;
            padding: 1px 2px;
            background: #A3A3A1;
        }
        a:hover {
            color: #0E0B06;
            background: none;
        }
        .wrapper {
            width: 520px margin: auto;
        }
        .header {
            display: block;
            margin: 30px 50px 75px 400px;
        }
        .indexer {
            display: block;
            margin: 70px 50px 75px 70px;
        }
        .poster {
            display: block;
            margin: 70px 50px 75px 400px;
            padding-bottom: 30px;
        }
    </style>
</head>
<body>
<div class="wrapper">
    <div class="header">
        <h1><a href="main.html">Web Server</a></h1>
        <h2>Internet and Web Technology Assignment <br> by <b>Juhi Aswani</b> and <b>Kartikey Kushwaha</b></h2>
    </div>
    <div class="indexer">
        <h2><b><font size="5px">Contents</font></b></h2>
        <br>Introduction
        <br>History
        <br>Common features
    </div>
    <div class="poster">
        <h2><b><font size="5px">1. Introduction</font</b></h2>
    </div>
</div>
</body>
</html>
 
     
     
     
     
    