I need the aside to be positioned on the right side and the section on the left side, both centered in the space.
Feel free to check out this link
<!DOCTYPE html>
<html>
<head>
<style>
#main {
width: 800px;
margin: 0 auto;
}
.righttt{
position: relative;
right: 0px;
width: 200px;
}
section {
overflow: left;
}
</style>
</head>
<body>
<header>
<h1>City Gallery</h1>
</header>
<div id="main">
<section>
<h1>London</h1>
<p>
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</p>
<p>
Standing on the River Thames, London has been a major settlement for two millennia,
its history going back to its founding by the Romans, who named it Londinium.
</p>
</section>
<section>
<h1>London</h1>
<p>
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</p>
<p>
Standing on the River Thames, London has been a major settlement for two millennia,
its history going back to its founding by the Romans, who named it Londinium.
</p>
</section>
<aside class="righttt">
<h1>London</h1>
<p>
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</p>
<p>
Standing on the River Thames, London has been a major settlement for two millennia,
its history going back to its founding by the Romans, who named it Londinium.
</p>
</aside>
</div>
<footer>
Copyright © W3Schools.com
</footer>
</body>
</html>