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                <a href="#id01">Ouvrir la fenêtre modale</a>

<div id="id01" class="modal">
  <div class="modal-dialog">
    <div class="modal-content">
      <header class="container"> 
        <a href="#" class="closebtn">×</a>
        <h2>Entête de modale</h2>
      <div class="container">
        <p>Texte dans la fenêtre modale.</p>  
      <footer class="container">
        <p>Pied de page de modale</p>



                /* Décrire l'animation */
@keyframes slideDownFadeIN {
    from {top:-100px;opacity: 0;}
    to {top:0px;opacity:1;}

/* Foncer l'arrière-plan de la fenêtre modale */
.modal {
  display: none; 
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.4);

/* Afficher la fenêtre modale lorsqu'elle est ciblée par un lien supprimer */
.modal:target {
  display: table;
  position: absolute;

/* la fenêtre modale  */
.modal-dialog {
  display: table-cell;
  vertical-align: middle;

/* Le contenu de la modale */
.modal-dialog .modal-content {
  margin: auto;
  background-color: #f3f3f3;
  position: relative;
  padding: 0;
  outline: 0;
  border: 1px #777 solid;
  text-align: justify;
  width: 80%;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
  animation-name: slideDownFadeIN;
  animation-duration: 0.5s;

/* Bouton servant à fermer la fenêtre modale */
.closebtn {
  text-decoration: none;
  float: right;
  font-size: 35px;
  font-weight: bold;
  color: #fff;

.closebtn:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;

.container {
  padding: 2px 16px;

header {
  background-color: #5cb85c;
  font-size: 25px;
  color: white;

footer {
  background-color: #5cb85c;
  font-size: 20px;
  color: white;