Edit in JSFiddle

<!DOCTYPE html>
<html>

  <head>
    <style>
      body { background-color: #9f9f9f;}
      h1 { color: indigo; }
      p {margin-left: 40px;}
    </style>
  </head>
  
  <body>
    <h1>Titre</h1>
    <p>Paragraphe.</p>
  </body>
  
</html>