Move header down css

<!DOCTYPE html>
<html>
<head>
    <title>Testing My HTML and CSS</title>
    <style>

        * {
            padding: 0;
            margin: 0;
        }

        .header {
            background-color: black;
            height: 100px;
            width: 100%;
        }

        .header h1 {
            margin-top: 0;
            text-align: center;
            color: white;
            height: 100px;
            width: 100%;
        }

        .sidebar {
            background-color: #ebebeb;
            position: absolute;
            width: 200px;
            height: 100%;
        }

    </style>
</head>
<body>
    <div class="header">
        <h1>Hello, World!</h1>
    <div class="sidebar">
    </div>
    <div class="content">
    </div>
    <div class="footer">
    </div>
</body>
</html>

Source: stackoverflow.com

Move header down css

.header {
  /* styles */
  position: fixed;
  margin-top: 50px; /* or whatever */
}

Source: codecademy.com

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