Edit in JSFiddle

Result
HTML
CSS

<html>
    <head><title>Aside tag in HTML5</title>
    </head>
    <body>
        <div>
          <aside>jQuery is amazing
        </aside>
        <p>jQuery is amazing to use. It makes your code small and easy to manage. jQuery has inbuilt functions which ,makes your life simple.</p>
        </div>
    </body>
</html>

aside
{
    font-size:larger;
    font-style:italic;
    color:green;
    float:right;
    width:35%;
    padding-left:5px;
}