JSFiddle - React, Tailwind, and code Playground

by Nikita Elsakov

HTML

<!DOCTYPE html>
<html>
<head>
	<title>LighBox</title>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link rel="stylesheet" href="font-awesome/css/font-awesome.min.css">
	<link rel="stylesheet" href="lightbox.css">
</head>
<body>
<div id="lb_container">
	<div id="overlay"></div>
	<div id="lb">
		<img src="img/pic1.jpg" alt="" id="lb_img">
	</div>
	<button id="close"><li class="fa fa-close" aria-hidden="true"></li></button>
	<button id="next"><li class="fa fa-chevron-right" aria-hidden="true"></li></button>
	<button id="prev"><li class="fa fa-chevron-left" aria-hidden="true"></li></button>
</div>

<div id="img_container">
	<ul>
		<li><img data-num="0" src="https://images.unsplash.com/photo-1505721333275-4ee98bb54a3b?dpr=1&auto=compress,format&fit=crop&w=1050&h=&q=80&cs=tinysrgb&crop=" alt=""></li>
		<li><img data-num="1" src="https://images.unsplash.com/photo-1495100793874-7f94aecae1fb?dpr=1&auto=compress,format&fit=crop&w=1050&h=&q=80&cs=tinysrgb&crop=" alt=""></li>
		<li><img data-num="2" src="https://images.unsplash.com/photo-1428509774491-cfac96e12253?dpr=1&auto=compress,format&fit=crop&w=1050&h=&q=80&cs=tinysrgb&crop=" alt=""></li>
		<li><img data-num="3" src="https://images.unsplash.com/photo-1472073834672-adb08feda350?dpr=1&auto=compress,format&fit=crop&w=634&h=&q=80&cs=tinysrgb&crop=" alt=""></li>
		<li><img data-num="4" src="https://images.unsplash.com/photo-1500335340127-8900b7080b2a?dpr=1&auto=compress,format&fit=crop&w=1050&h=&q=80&cs=tinysrgb&crop=" alt=""></li>
		<li><img data-num="5" src="https://images.unsplash.com/photo-1504125130065-19cd3d71c27a?dpr=1&auto=compress,format&fit=crop&w=634&h=&q=80&cs=tinysrgb&crop=" alt=""></li>
		<li><img data-num="6" src="https://images.unsplash.com/photo-1501371703172-850ab6b6e282?dpr=1&auto=compress,format&fit=crop&w=707&h=&q=80&cs=tinysrgb&crop=" alt=""></li>
		<li><img data-num="7"...

CSS

html, body
{
    height: 100%;
    background: #263238;
    margin: 0;
    box-shadow: inset 0 0 10px #212121;
    overflow-y: scroll;
}

#lb_container
{
    position: fixed;
    top: 0px;
    left: 0px;
    height: 100%;
    width: 100%;
    display: none;
    justify-content: center;
    align-items: center;
}

#lb
{
    position: relative;
    width: 80%;
    height: 80%;
    box-shadow: 0 0 4px #3F3B3B;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #000;
    z-index: 10000;
}

#lb_img
{
    z-index: 9999;
    max-width: 100%;
    height: auto;
}

#overlay
{
    background: rgba(33,33,33,.8);
    position: absolute;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
}

#prev, #next
{
    background: transparent;
    border: none;
    position: absolute;
    cursor: pointer;
    font-size: 2rem;
    height: 100px;
    width: 50%;
    display: flex;
    color: #212121;
    text-shadow: 0 0 4px #ECEFF1;
}

#prev
{
    justify-content: left;
    left: 0;
}

#next
{
    justify-content: flex-end;
    right: 0;
}

#close
{
    text-shadow: 0 0 4px #ECEFF1;
    color: #212121;
    font-size: 2rem;
    background: transparent;
    border: none;
    position: absolute;
    top: 10px;
    right: 10px;
    cursor: pointer;
}

#img_container
{
    padding: .1rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

#img_container img:hover
{
    cursor: pointer;
}

#img_container ul
{
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    align-items: flex-start;
    justify-content: left;
}

#img_container ul li
{
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    width: calc(100% / 3);
    overflow: hidden;
}

#img_container ul li img
{
    max-width: 100%;
    height: auto;
    transition: transform .3s;
}

#img_container ul li img:hover
{
    transform: scale(1.5,1.5);
}

 /* TODO: find out how to...

JavaScript

var lb = document.getElementById( 'lb_container' );
var imgs = document.querySelectorAll( '#img_container img' );
var lb_img = document.getElementById( 'lb_img' );
var active_img = null;

for(var i = 0; i < imgs.length; ++i)
{
    imgs[i].onclick = showImageInLb;
    imgs[i].onmouseleave = this;
}

function showImageInLb()
{
    active_img = this.getAttribute( 'data-num' );
    lb_img.src = this.src;
    showLb();
}

function showNext()
{
    var next = parseInt(active_img) + 1;
    lb_img.src = document.querySelector('img[data-num="'+next+'"]').src;
    active_img = next;
}

function showPrev()
{
    var prev = parseInt(active_img) - 1;
    lb_img.src = document.querySelector('img[data-num="'+prev+'"]').src;
    active_img = prev;
}

function showLb()
{
    lb.style.display = 'flex';
}

function hideLb()
{
    lb.style.display = 'none';
}

document.getElementById( 'close' ).onclick = hideLb;
document.getElementById( 'overlay' ).onclick = hideLb;
document.getElementById( 'next' ).onclick = showNext;
document.getElementById( 'prev' ).onclick = showPrev;