Éditeur Tryit de W3Schools

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
* {
marge: 0;
padding: 0;
box-sizing: border-box;
}

h1 {
text-align: center;
padding: 20px;
}

.gallery {
afficher: flex;
flex-wrap: wrap;
justify-content: flex-start;
padding: 0 15px;
}

.gallery-item {
position: relative;
largeur: calc(25% - 20px);
hauteur: auto;
marge: 10px;
curseur: pointeur;
transition: transform 0.5s ease;
}

.gallery-item:hover {
transform: scale(1.1);
}

/* La Modale (arrière-plan) */
.modal {
afficher: aucun;
position: fixe;
z-index: 1000;
gauche: 0;
haut: 0;
largeur: 100%;
hauteur: 100%;
couleur-de-fond: rgba(0, 0, 0, 0.8);
align-items: center;
justify-content: center;
transition: opacity 0.5s ease;
}

/* Contenu modal (image) */
.modal-content {
position: relative;
largeur: 90%;
hauteur: auto;
max-width: 90%;
max-height: 90%;
border-radius: 5px;
débordement: caché;
animation: zoomIn 0.5s;
}

@keyframes zoomIn {
from {transform: scale(0.6);}
à {transform: scale(1);}
}

.modal.show {
afficher: flex;
opacité: 1;
}

/* Bouton de fermeture */
.close {
position: absolute;
haut: 10px;
droite: 15px;
couleur: #ffffff;
taille-de-police: 35px;
font-weight: bold;
curseur: pointeur;
transition: transform 0.3s;
}

/* Légende de l'image modale */
.caption {
position: absolute;
bas: 15px;
largeur: 100%;
text-align: center;
couleur: #ffffff;
taille de police: 24px;
}

@media screen and (max-width: 768px) {
.gallery-item {
largeur: calc(50% - 20px);
}
}

@media screen and (max-width: 480px) {
.gallery-item  {
largeur: calc(100% - 20px);
}
}
</style>
</head>
<body>

<h1>Images modales réactives</h1>
    
<div class="gallery">
  <img src="img_5terre.jpg" alt="Cinque Terre" class="gallery-item" onclick="openModal('modal1', 'Cinque Terre')" width="600" height="400">
  <img src="img_forest.jpg" alt="Forest" class="gallery-item" onclick="openModal('modal2', 'Forest')" width="600" height="400">
  <img src="img_lights.jpg" alt="Northern Lights" class="gallery-item" onclick="openModal('modal3', 'Nothern Lights')" width="600" height="400">
  <img src="img_mountains.jpg" alt="Mountains" class="gallery-item" onclick="openModal('modal4', 'Mountains')" width="600" height="400">
</div>

<div id="modal1" class="modal">
  <span class="close" onclick="closeModal('modal1')">&times;</span>
  <img src="img_5terre.jpg" alt="Cinque Terre" class="modal-content" width="600" height="400">
  <div class="caption"></div>
</div>

<div id="modal2" class="modal">
  <span class="close" onclick="closeModal('modal2')">&times;</span>
  <img src="img_forest.jpg" alt="Forest" class="modal-content" width="600" height="400">
  <div class="caption"></div>
</div>

<div id="modal3" class="modal">
  <span class="close" onclick="closeModal('modal3')">&times;</span>
  <img src="img_lights.jpg" alt="Northern Lights" class="modal-content" width="600" height="400">
  <div class="caption"></div>
</div>

<div id="modal4" class="modal">
  <span class="close" onclick="closeModal('modal4')">&times;</span>
  <img src="img_mountains.jpg" alt="Mountains" class="modal-content" width="600" height="400">
  <div class="caption"></div>
</div>

function closeModal(modalId) {
let modal = document.getElementById(modalId);
modal.classList.remove("show");
setTimeout(function () {
modal.style.display = "none";
modal.querySelector(".caption").innerText = "";
}, 300);
}
</script>
</body>

</html>