Learn how to create a modal image gallery (lightbox) with CSS and JavaScript.

Lightbox (Modal Image Gallery)

Create A Lightbox

Step 1) Add HTML:

Step 2) Add CSS:

Step 3) Add JavaScript:

Full Code:

* {
box-sizing: border-box;
}

.row > .column {
padding: 0 8px;
}

.row:after {
content: "";
display: table;
clear: both;
}

.column {
float: left;
width: 25%;
}

/* The Modal (background) */
.modal {
display: none;
position: fixed;
z-index: 1;
padding-top: 100px;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: black;
}

/* Modal Content */
.modal-content {
position: relative;
background-color: #fefefe;
margin: auto;
padding: 0;
width: 90%;
max-width: 1200px;
}

/* The Close Button */
.close {
color: white;
position: absolute;
top: 10px;
right: 25px;
font-size: 35px;
font-weight: bold;
}

.close:hover,
.close:focus {
color: #999;
text-decoration: none;
cursor: pointer;
}

.mySlides {
display: none;
}

.cursor {
cursor: pointer
}

/* Next & previous buttons */
.prev,
.next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
padding: 16px;
margin-top: -50px;
color: white;
font-weight: bold;
font-size: 20px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
user-select: none;
-webkit-user-select: none;
}

/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover,
.next:hover {
background-color: rgba(0, 0, 0, 0.8);
}

/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}

img {
margin-bottom: -4px;
}

.caption-container {
text-align: center;
background-color: black;
padding: 2px 16px;
color: white;
}

.demo {
opacity: 0.6;
}

.active,
.demo:hover {
opacity: 1;
}

img.hover-shadow {
transition: 0.3s
}

.hover-shadow:hover {
box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19)
}
</style>
<body>

<h2 style="text-align:center">Lightbox</h2>

<div class="row">
<div class="column">
<img src="img_nature.jpg" style="width:100%" onclick="openModal();currentSlide(1)" class="hover-shadow cursor">
</div>
<div class="column">
<img src="img_fjords.jpg" style="width:100%" onclick="openModal();currentSlide(2)" class="hover-shadow cursor">
</div>
<div class="column">
<img src="img_mountains.jpg" style="width:100%" onclick="openModal();currentSlide(3)" class="hover-shadow cursor">
</div>
<div class="column">
<img src="img_lights.jpg" style="width:100%" onclick="openModal();currentSlide(4)" class="hover-shadow cursor">
</div>
</div>

<div id="myModal" class="modal">
<span class="close cursor" onclick="closeModal()">&times;</span>
<div class="modal-content">

<div class="mySlides">
<div class="numbertext">1 / 4</div>
<img src="img_nature_wide.jpg" style="width:100%">
</div>

<div class="mySlides">
<div class="numbertext">2 / 4</div>
<img src="img_fjords_wide.jpg" style="width:100%">
</div>

<div class="mySlides">
<div class="numbertext">3 / 4</div>
<img src="img_mountains_wide.jpg" style="width:100%">
</div>

<div class="mySlides">
<div class="numbertext">4 / 4</div>
<img src="img_lights_wide.jpg" style="width:100%">
</div>

<a class="prev" onclick="plusSlides(-1)">&#10094;</a>
<a class="next" onclick="plusSlides(1)">&#10095;</a>

<div class="caption-container">
<p id="caption"></p>
</div>
<div class="column">
<img class="demo cursor" src="img_nature_wide.jpg" style="width:100%" onclick="currentSlide(1)" alt="Nature and sunrise">
</div>
<div class="column">
<img class="demo cursor" src="img_fjords_wide.jpg" style="width:100%" onclick="currentSlide(2)" alt="Trolltunga, Norway">
</div>
<div class="column">
<img class="demo cursor" src="img_mountains_wide.jpg" style="width:100%" onclick="currentSlide(3)" alt="Mountains and fjords">
</div>
<div class="column">
<img class="demo cursor" src="img_lights_wide.jpg" style="width:100%" onclick="currentSlide(4)" alt="Northern Lights">
</div>
</div>
</div>

<script>
function openModal() {
document.getElementById('myModal').style.display = "block";
}

function closeModal() {
document.getElementById('myModal').style.display = "none";
}

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
showSlides(slideIndex += n);
}

function currentSlide(n) {
showSlides(slideIndex = n);
}

function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("demo");
var captionText = document.getElementById("caption");
if (n > slides.length) {slideIndex = 1}
if (n < 1) {slideIndex = slides.length}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
captionText.innerHTML = dots[slideIndex-1].alt;
}
</script>

</body>
</html>

CLICK HERE TO VIEW FUNCTIONING MODAL IMAGE GALLERY

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