Set the side margins to 50px, the top margin to 30px, and the bottom margin to 20px.

<html>
<head>
<style>
h1 {
margin-left: 50px;
margin-right: 50px;
margin-top: 30px;
margin-bottom: 20px;
border: solid;
text-align: center;
}
</style>
</head>
<body>
<h1>The London Thames Newspaper</h1>
</body>
</html>]]>