p.a {
font: 15px arial, sans-serif;
}
p.b {
font: italic bold 12px/30px Georgia, serif;
}
<!DOCTYPE html>
<html lang="ko">
<head></head>
<body>
<p class="a">This is a paragraph. The font size is set to 15 pixels, and the font family is Arial.</p>
<p class="b">This is a paragraph. The font is set to italic and bold, the font size is set to 12 pixels, the line height is set to 30 pixels, and the font family is Georgia.</p>
</body>
</html>