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                <!DOCTYPE html>
        <title>Centrer un élément</title>
        <meta charset="utf-8">
        <link rel="stylesheet" href="centrer.css">
        <div class="fb">
          <p>Un premier paragraphe flex</p>
        <div class="fb">
          <p>Un autre paragraphe flex</p>
          <a href="#">Un lien flex</a>
        <div class="gd gdc1">
          <p>Un premier paragraphe élément de grille</p>
        <div class="gd gdc2">
          <p>Un autre paragraphe élément de grille</p>
          <a href="#">Un lien élément de grille</a>


                /*Ces styles ne sont là que pour la présentation*/
  border: 3px solid #3CC;
  margin: 10px 10px;

    display: flex;
    flex-wrap: wrap; /*Optionner - permet aux éléments de passer à la ligne en cas de besoin*/
    justify-content: center; /*Permet de centrer dans l'axe principal*/

    display: grid;
    justify-items: center; /*Evite que les éléments prennent tout l'espace dans leur colonne*/
    justify-content: center; /*Permet de centrer dans l'axe horizontal*/
  grid-template-columns: 100%;
  grid-template-columns: 50% 50%;