You'd do it the same way you'd style anything in a page. After embedding the XML, you've got a regular table like this (even though it's all on one line):
HTML Code:
<table border="1"><thead><tr><th>Rank</th><th>Name</th><th>Production</th></tr></thead><tbody><tr><td>1</td><td>Saudi Arabia</td><td>Produces 10.72 million barrels per day</td></tr><tr><td>2</td><td>Russia</td><td>Produces 9.67 million barrels per day</td></tr><tr><td>3</td><td>United States</td><td>Produces 8.37 million barrels per day</td></tr><tr><td>4</td><td>Iran</td><td>Produces 4.12 million barrels per day</td></tr><tr><td>5</td><td>Mexico</td><td>Produces 3.71 million barrels per day</td></tr><tr><td>6</td><td>China</td><td>Produces 3.84 million barrels per day</td></tr><tr><td>7</td><td>Canada</td><td>Produces 3.23 million barrels per day</td></tr><tr><td>8</td><td>United Arab Emirates</td><td>Produces 2.94 million barrels per day</td></tr><tr><td>9</td><td>Venezuela</td><td>Produces 2.81 million barrels per day</td></tr><tr><td>10</td><td>Norway</td><td>Produces 2.79 million barrels per day</td></tr></tbody></table>