Edit in JSFiddle

CSS
HTML
Result

p.normal {
  font-style: normal;
}

p.italic {
  font-style: italic;
}

p.oblique {
  font-style: oblique;
}

<!DOCTYPE html>
<html lang="ko">
  <head></head>
  <body>
    <h1>CSS font-style</h1>
    <p class="normal">This is a paragraph in normal style.</p>
    <p class="italic">This is a paragraph in italic style.</p>
    <p class="oblique">This is a paragraph in oblique style.</p>
  </body>
</html>