Center the text, set the quote 10 pixels away from its border, and 20 pixels away from the other elements.

<html>
<head>
<style>
.centered {
text-align: center;
}
.quote {
border: solid GoldenRod;
padding: 10px;
margin: 20px;
}
</style>
</head>
<body>
<h1 class="centered">Journey to the Center of the Earth</h1>
<p class="quote">
<em>Looking back to all that has occurred to me since that eventful day, I am scarcely able to believe in the reality of my adventures. They were truly so wonderful that even now I am bewildered when I think of them.</em></p>
</body>
</html>]]>

Make sure to pick text-align, followed by padding, and finally margin.