It's best if the heading is more noticeable, so set font-family to Impact.

<html> <body> <h2 style="font-family: Impact;">UV Protection Chart</h2> <p> Extreme: wear sunscreen, sunglasses, a hat and look for shade.</p> <p>Medium: wear sunscreen, sunglasses, and a hat.</p> <p>Low: wear sunscreen and sunglasses.</p> </body> </html>]]>

Make sure to pick font followed by - and then family, :, Impact, ;.