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Babel includes JSX processing.

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                <h1>Un titre de niveau 1</h1>

<!--Le div occupe toute la largeur du body et les paragraphes sont centrés dans le div-->
  <p class="bloc-centre">Un premier paragraphe</p>
  <p class="bloc-centre">Un deuxième paragraphe</p>

<!--Le texte est centré dans l'élément p qui occupe toute la largeur de la page-->
<p class="texte-centre">Un autre paragraphe</p>

<!--Le texte est centré dans le paragraphe et l'élément p est centré par rapport à son parent qui est le div. Le div n'est lui pas centré dans la page-->
<div class="conteneur">
  <p class="bloc-centre texte-centre">Un premier paragraphe</p>
  <p class="bloc-centre texte-centre">Un deuxième paragraphe</p>


  margin: 0px;

  background-color: #0AE;/*Bleu*/
  background-color: #0EA;/*Vert*/
  width: 80%;
  margin: 0 auto;

  text-align: center;
  width: 80%;