Italicize the text.

<html> <body> <h1>Fontastic - where fonts tell a story</h1> <p">Construction on the Tower of Pisa began in 1173.</p> <p style="font-style: italic;">Unfortunately, the tower started to lean throughout the 12th century because of the soft ground, leading to the Leaning Tower of Pisa we know today.</p> </body> </html>]]>

Make sure to pick style, followed by font-style, and finally italic.