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HTML 

              
                <div class="center">
	<h2>Click on a picture to launch the lightbox</h2>
	<a href='http://www.jpg-design.com/menu/home' class='blue'>www.jpg-design.com</a>
</div>
<article class=border>
	<section class=grid-container>
		<div class=item>
			<figure title='Agrandir'>
				<img itemprop='image' src='https://unsplash.it/600/400?random=1' alt='txt' class=bitmap />
				<figcaption>description</figcaption>
			</figure>
		</div>
<div class=item-txt>
  <div>
		<h2>Title</h2>
			<p>Project : Lightbox</p>
					Some text
	</div>
	</section>				
	<section class=grid-container>
		<div class=item>
			<div>
			<div class='figure-text'>
				<h2>Title</h2>
			<p>Project : Lightbox</p>
					Some text
			</div>
<!-- wrap img with figure -->
				<figure title='Agrandir'>
					<img itemprop='image' src='https://unsplash.it/600/400?random=2' alt='txt' class=bitmap />
<!-- figcaption is useful but not mandatory -->
					<figcaption>description</figcaption>
				</figure>
<!-- wrap img with figure end -->
			</div>
		</div>
		<div class='item-txt'>
			<div>
				<div class='figure-text'>
					<h2>Title</h2>
			<p>Project : Lightbox</p>
					Some text
				</div>
				<figure title='Agrandir'>
					<img itemprop='image' src='https://unsplash.it/600/400?random=3' alt='txt' class=bitmap />
					<figcaption>description</figcaption>
				</figure>
		</div>
	</section>
	<section class='grid-container'>
		<div class='item'>
			<figure title='Agrandir'>
				<img itemprop='image' src='https://unsplash.it/600/400?random=4' alt='txt' class=bitmap />
				<figcaption>description</figcaption>
			</figure>
		</div>
		<div class='item-txt'>
			<figure title='Agrandir'>
				<img itemprop='image' src='https://unsplash.it/600/400?random=5' alt='txt' class=bitmap />
				<figcaption>description</figcaption>
			</figure>
		</div>
	</section>
</article>
<!-- lightbox -->
<div id="lightbox" class="hide">
	<!-- controls / figure -->
	<div id="lightbox_flex">
		<!-- previous button -->
		<div id="prev">
			<svg viewBox="0 0 20 36" fill-rule="evenodd" clip-rule="evenodd" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="1.5" fill="none" stroke-width="1">
				<path d="M17.9 2.4L2.3 18 18 33.6"/>
			</svg>
		</div>
		<div id="placefig">
			<div id="lightbox_top">
				<!-- counter -->
				<div id="counter_div">
					<span id="current_index"></span>
					<span id="total_index"></span>
				</div>
				<!-- close button -->
				<div id="close_btn">
					<span id="close_txt" class="uppercase_font">Fermer</span>
						<svg viewBox="0 0 18 18" width="18" height="18" fill-rule="evenodd" clip-rule="evenodd" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="1.5" fill="none" stroke-width="1">
							<path d="M16.5 1.5l-15 15M1.5 1.5l15 15"/>
						</svg>
					</span>
				</div>
			</div>
		</div>
		<!-- next button -->
		<div id="next">
			<svg viewBox="0 0 20 36" fill-rule="evenodd" clip-rule="evenodd" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="1.5" fill="none" stroke-width="1">
				<path d="M2 2.3L17.6 18 2 33.4"/>
			</svg>
		</div>
	</div>
</div>
!

CSS 

              
                html {
	--txt: #ccc;
	--hover: #fa4b2c;
}
.center {text-align: center;padding:1em;}
/* elements display */
.hide {display: none;}
.bitmap {
	max-width: 100%;
	height: auto;
}
figure {cursor: zoom-in;}
figcaption{
	color: #999;
	text-align: center;
	padding-top: 1.5em;
}
/* lightbox css */
#lightbox {
	position: fixed;
	z-index: 9;
	text-align: center;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	padding: 1em;
	background: rgba(0, 0, 0, .8);
	/* Enable scroll if needed */
	overflow: auto;
}

#lightbox_flex {
	display: flex;
	justify-content: center;
}

#placefig {
	width: 100%;
}

#placefig > figure {
	cursor: default;
}

#placefig > figure > .bitmap,
#placefig > figure > picture > img {
	width: auto;
	max-height: 90vh;
}

/* Close button */
#lightbox_top {
	display: flex;
	justify-content: space-around;
	color: var(--txt);
}

#counter_div {
	margin-left: 1em;
	line-height: 2.4em
}

#close_btn {
	user-select: none
}

#close_btn:focus,
#close_btn:hover {
	color: var(--hover);
	text-decoration: none;
	cursor: pointer
}

#close_txt {
	margin-right: .4em
}

#close_btn > svg {
	stroke: var(--txt);
	vertical-align: sub;
}

#close_btn:hover > svg {
	stroke: var(--hover);
	stroke-width: 2px;
}

#current_index,
#total_index {
	color: var(--txt);
}

/* Next & previous buttons */
#next,
#prev {
	cursor: pointer;
	user-select: none;
	padding: 1em;
	height: max-content;
	margin-top: 4em;
}

#next > svg,
#prev > svg {
	width: 20px;
	height: 36px;
	stroke: var(--txt);
	vertical-align: middle;
}

#next > svg {
	margin-left: 10px;
}

#prev > svg {
	margin-right: 10px;
}

#next:hover,
#prev:hover {
	background-color: #000
}

#next:hover > svg,
#prev:hover > svg {
	stroke: #ace3cc;
	stroke-width: 2px;
}

/* Next & previous buttons breakpoint */
@media (max-width: 400px) {

	#next,
	#prev {
		padding: 4px;
	}

	#prev > svg,
	#next > svg {
		width: 10px;
		height: 18px;
	}

	#prev > svg {
		margin-right: 4px;
	}

	#next > svg {
		margin-left: 4px;
	}

}

/* Number text (1/3 etc) */
.numbertext {
	color: var(--txt);
	font-size: 12px;
	padding: 8px 12px;
	position: absolute;
	top: 0
}
/* place your css here ************************************/
.grid-container {
	display: grid;
	grid-template-columns: 1fr 1fr;
	background-color: var(--corporate-white);
}
.border {border: 1px solid var(--corporate-black);}
.item,.item-txt,.item-top {
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 20%;
}
.item,.item-top {
	border-top: 1px solid var(--corporate-black);
	border-right: 1px dashed var(--corporate-black);
	border-bottom: 1px solid var(--corporate-black);
	border-left: 1px solid var(--corporate-black);
}
.item-txt {
	border-top: 1px solid var(--corporate-black);
	border-right: 1px solid var(--corporate-black);
	border-bottom: 1px solid var(--corporate-black);
	border-left: none;
}
@media (max-width: 800px) {
	.grid-container {
		grid-template-columns: auto;
	}
	.item,.item-top {
		border-top: 1px solid var(--corporate-black);
		border-right: 1px solid var(--corporate-black);
		border-bottom: 1px dashed var(--corporate-black);
		border-left: 1px solid var(--corporate-black);
	}
	.item-txt {
		border-top: none;
		border-right: 1px solid var(--corporate-black);
		border-bottom: 1px solid var(--corporate-black);
		border-left: 1px solid var(--corporate-black);
	}
}
/* scroll to Top button */
#topBtn {
	display: none;
	position: fixed;
	bottom: 20px;
	right: 30px;
	z-index: 99;
	font-size: 18px;
	outline: none;
	border: var(--corporate-black) 1px dashed;
	background-color: var(--corporate-white);
	color: var(--corporate-black);
	cursor: pointer;
	padding: 18px;
	border-radius: 3px;
}
#topBtn:hover {
	border: var(--corporate-black) 1px solid;
}
/* variable colors */
:root {
	--corporate: #471a46;
	--corporate-bkg: #ace3cc;
	--corporate-black: #222;
	--corporate-white: #fff;
	--brand-blue: #0071BC;
	--brand-red: #fa4b2c;
}
.red {color: var(--brand-red)}
.blue {color: var(--brand-blue);text-decoration:none;}
a.blue:hover {color: var(--brand-red)}
!

JS 

              
                // figure tag triggers the lightbox :
// get all figures in a Node list
const allFigsNodeList = document.querySelectorAll('figure'),
	// lightbox
	lightBox = document.getElementById('lightbox'),
	placeFig = document.getElementById('placefig'),
	lightboxTop = document.getElementById('lightbox_top'),
	counter = document.getElementById('counter_div'),
	closeBtn = document.getElementById('close_btn'),
	currentIndexTxt = document.getElementById('current_index'),
	totalIndexTxt = document.getElementById('total_index'),
	nextBtn = document.getElementById('next'),
	prevBtn = document.getElementById('prev');

// title loop
defaultTitle();
// loop items
allFigsNodeList.forEach((currentFig, index) => {
	currentFig.onclick = () => {

		openLightBox();
		// hide Buttons;
		hidePrevBtn(index);
		hideNextBtn(index);
		let currentIndex = index + 1;

		displayCurrentIndex(currentIndex);
		totalIndexTxt.textContent = allFigsNodeList.length;

		// clone cliqued figure
		const figClone = currentFig.cloneNode(true);
		// place cliqued figure
		placeFig.appendChild(figClone);
		// prev next buttons
		prevBtn.addEventListener('click', prevFig);
		nextBtn.addEventListener('click', nextFig);

		function prevFig() {
			let prevFig = allFigsNodeList[--index];
			currentIndex = index + 1;
			displayCurrentIndex(currentIndex);
			if (index <= 0) {
				prevBtn.style.visibility = 'hidden';
				prevFig = allFigsNodeList[0];
				index = 0;
				currentIndex = index + 1;
				displayCurrentIndex(currentIndex);
			} else {
				showBtns();
			}
			prevFigClone = prevFig.cloneNode(true);
			placeFig.appendChild(prevFigClone);
			placeFig.removeChild(placeFig.querySelector('figure'));
		}

		function nextFig() {
			let nextFig = allFigsNodeList[++index];
			currentIndex = index + 1;
			displayCurrentIndex(currentIndex);
			if (index >= allFigsNodeList.length - 1) {
				nextBtn.style.visibility = 'hidden';
				nextFig = allFigsNodeList[allFigsNodeList.length - 1];
				index = allFigsNodeList.length - 1;
				currentIndex = allFigsNodeList.length;
				displayCurrentIndex(currentIndex);
			} else {
				showBtns();
			}
			nextFigClone = nextFig.cloneNode(true);
			placeFig.appendChild(nextFigClone);
			placeFig.removeChild(placeFig.querySelector('figure'));
		}
		// close lightBox
		closeBtn.onclick = () => {
			closeLightBox();
		};
		window.onclick = (event) => {
			if (event.target == lightBox) {
				closeLightBox();
			}
		}
		document.onkeyup = (event) => {
			if (event.key === 'Escape') {
				closeLightBox();
			}
		}
		// prev next keys < >
		document.addEventListener('keydown', keyHandler);
		function keyHandler(e) {
			// Left Arrow
			if (e.keyCode === 37 || (e.ctrlKey && e.keyCode === 37)) {
				// e.preventDefault();
				prevFig();
			}
			// Right Arrow
			if (e.keyCode === 39 || (e.ctrlKey && e.keyCode === 39)) {
				// e.preventDefault();
				nextFig();
			}
		}
	}
});

function displayCurrentIndex(currentIndex) {
	currentIndexTxt.textContent = currentIndex + ' / ';
}

function hidePrevBtn(index) {
	if (index == 0) {
		prevBtn.style.visibility = 'hidden';
	} else {
		prevBtn.style.visibility = 'visible';
	}
}

function hideNextBtn(index) {
	if (index == allFigsNodeList.length - 1) {
		nextBtn.style.visibility = 'hidden';
	} else {
		nextBtn.style.visibility = 'visible';
		nextBtn.style.display = 'block';
	}
}

function showBtns() {
	prevBtn.style.visibility = 'visible';
	nextBtn.style.visibility = 'visible';
}

function openLightBox() {
	lightBox.classList.remove('hide');
	allFigsNodeList.forEach(titleTag => {
		titleTag.title = 'touche ESC pour fermer | flèches pour naviguer';
	});
}

function closeLightBox() {
	lightBox.classList.add('hide');
	placeFig.removeChild(placeFig.querySelector('figure'));
	defaultTitle();
}

function defaultTitle() {
	allFigsNodeList.forEach(titleTag => {
		titleTag.title = 'Agrandir';
	});
}
!
999px

Console