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Code Indentation

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                <!--Note : Je vous rappelle que la structure des pages HTML et l'élément body sont automatiquement inclus par CodePen-->
<h1>Un titre de niveau 1</h1>
<!--Note : Utiliser href="#" permet de créer un lien HTML valide mais
        qui ne mène nulle part (qui est "vide"), ce qui est parfois utile-->
<a href="#">Un lien</a>
<p>Un premier paragraphe</p>
<a href="#">Un autre lien</a>
<p>Un autre paragraphe avec un <a href="#">lien</a></p>
  <li><a href="#">Elément de liste (lien) 1</a></li>
  <li>Elément de liste 2</li>
<a href="#">Un dernier lien</a>


                /*Applique une couleur de fond jaune à tout élément a
 *suivant un élément p et de même niveau*/
p ~ a{
    background-color: yellow;