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HTML

              
                <div id="viewport"></div>
              
            
!

CSS

              
                * {
	box-sizing: border-box;
	-moz-box-sizing: border-box;
	-webkit-box-sizing: border-box;
}
body {
	background-color: #f1f1f1;
	display: flex;
	font-family: 'Lato', sans-serif;
	font-size: 0.875rem;
	font-weight: 400;
	color: #2c3e50;
	height: 100vh;
	overflow-y: hidden;
}
/* CUSTOM SCROLLBAR FOR CHATBOX */
.chats::-webkit-scrollbar { width: 0.125rem; }
.chats::-webkit-scrollbar-thumb { background: #CFD8DC; }
.chats::-webkit-scrollbar-thumb:hover { background: #B0BEC5; }
/* INPUT TEXT PLACEHOLDER CUSTOMIZE */
::-webkit-input-placeholder { color: #B0BEC5; }
::-moz-placeholder { color: #B0BEC5; }
:-ms-input-placeholder { color: #B0BEC5; }
:-moz-placeholder { color: #B0BEC5; }

#viewport { 
	display: flex;
	flex: 1;
	justify-content: center;
	align-items: center;
}
#viewport > .chatbox {
	position: relative;
	display: table;
	float: left;
	margin: 1rem;
	width: 20rem;
	height: 36rem;
	background-color: white;
	box-shadow: 0 0.25rem 2rem rgba(38,50,56, 0.1);
	overflow: hidden;
}
#viewport > .chatbox > .chats {
	position: absolute;
	top: 0; left: 0; bottom: 0; right: 0;	
	display: table-cell;
	vertical-align: bottom;
	padding: 1rem;
	margin-bottom: 2.875rem;
	overflow: auto;
}
ul { padding: 0; }
ul > li {
	position: relative;
	list-style: none;
	display: block;
	margin-top: 1.5rem;
	margin: 1rem 0;
	transition: 0.5s all;
}
ul > li:after {
	display: table;
	content: '';
	clear: both;
}
.msg {		
	max-width: 85%;
	display: inline-block;
	padding: 0.5rem 1rem;
	line-height: 1rem;
	min-height: 2rem;
	font-size: 0.875rem;
	border-radius: 1rem;
	margin-bottom: 0.5rem;
	word-break: break-all;
	text-transform: capitalize;
}
.msg.him {
	float: left;
	background-color: #E91E63;
	color: #fff;
	border-bottom-left-radius: 0.125rem;
}
.msg.you {
	float: right;
	background-color: #ECEFF1;
	color: #607D8B;
	border-bottom-right-radius: 0.125rem;
}
.msg.load { 
	background-color: #F8BBD0; 
	border-bottom-left-radius: 0.125rem;
}
.msg > span {
	font-weight: 500;
	position: absolute;
}
.msg > span.partner {
	color: #B0BEC5;
	font-size: 0.5rem;
	top: 0;
	font-size: 0.675rem;
	margin-top: -1rem;
}
.msg > span.time {
	color: #CFD8DC;
	font-size: 0.5rem;
	bottom: -0.35rem;
	display: none;
}
.msg:hover span.time { display: block; }
.msg.him > span { left: 0;	 }
.msg.you > span {	right: 0; }
.sendBox {
	position: absolute;
	bottom: 0;
	left: 0;
	width: 100%;
	background: white;
}
.sendBox input {
	font-family: 'Lato', sans-serif;
	font-size: 0.875rem;
	display: block;
	width: 100%;
	border: none;
	padding: 0.75rem 0.75rem;
	line-height: 1.25rem;
	border-top: 0.125rem solid #ECEFF1;
	transition: 0.5s ease-in-out;
}
input:hover,
input:focus,
input:active { 
	outline: none!important; 
	border-top: 0.125rem solid #E91E63;
}

/*  LOADING MESSAGE CSS */
.load .dot {
	display: inline-block;
	width: 0.375rem;
	height: 0.375rem;
	border-radius: 0.25rem;
	margin-right: 0.125rem;
	background-color: rgba(255,255,255,0.75);	
}
.load .dot:nth-last-child(1) {animation: loadAnim 1s .2s linear infinite;}
.load .dot:nth-last-child(2) {animation: loadAnim 1s .4s linear infinite;}
.load .dot:nth-last-child(3) {animation: loadAnim 1s .6s linear infinite;}
@keyframes loadAnim {
    0 {transform: translate(0,0);}
    25% {transform: translate(0,-0.25rem);}
    50% {transform: translate(0,0);}
}
              
            
!

JS

              
                $(function(){
	// You can add Users inside JSON users section
	var _json = {
		users: ["Gupi Gain", "Bagha Bain", "Hirak Raja"],
		chats: [{
			from: 'Gupi Gain',
			msg: 'Mora Dujonai Rajar Jamai!',
			time: '1533263925814',
			action: ''
		}, {
			from: 'Bagha Bain',
			msg: 'Jamai!',
			time: '1533263925814',
			action: ''
		}, {
			from: 'Gupi Gain',
			msg: 'Mora Khai Dai Ghuri Firi!',
			time: '1533263925814',
			action: ''
		},{
			from: 'Gupi Gain',
			msg: 'Aha ki Moder Chiri!',
			time: '1533263925814',
			action: ''
		}]
	};
		
	init();
	function init () {
		renderData();
	};	
	
	// RENDER METHODS
	function renderData () {
		var _now = $.now();
		getDateTime(_now);
		_json.users.forEach(function (user) {
			var userID = user.replace(/ /g,"_");
			var parentString = '<div class="chatbox" id="'+userID+'">'+
				 '<div class="chats">'+
				 '<ul></ul>'+
				 '</div>'+
				 '<div class="sendBox">'+
				 '<input type="text" placeholder="enter next line '+ user.split(' ')[0]+'...">'+
				 '</div>';	
			$('#viewport').append(parentString);
			_json.chats.forEach(function (chat) {
				var _cl;
				(chat.from === user) ? _cl = 'you' : _cl = 'him';
				var dataString = '<li>'+
					 '<div class="msg ' + _cl +'">'+
					 '<span class="partner">'+ chat.from +'</span>'+
					 chat.msg +
					 '<span class="time">' + getDateTime (chat.time) + '</span>'+
					 '</div></li>';
				$('#viewport #'+ userID +' .chats>ul').append(dataString);		
			});
		});		
	};
	
	function newMsgRender (data) {
		$('#viewport .chats ul>li.pending').remove();
		_json.users.forEach(function (user) {
			var checkID = user.replace(/ /g,"_");
			var _cl = '';
			(data.from === user) ? _cl = 'you' : _cl= 'him';					
			$('#viewport .chatbox#'+ checkID +' .chats ul')
				.append('<li><div class="msg '+_cl+'">'+
						  '<span class="partner">'+ data.from +'</span>'+
						  data.msg +
						  '<span class="time">' + getDateTime (data.time) + '</span>'+
						  '</div>'+
						  '</li>');	
		});
	}
	
	function pendingRender (typingUser) {
		var pending = '<li class="pending">'+
			 '<div class="msg load">'+
			 '<div class="dot"></div>'+
			 '<div class="dot"></div>'+
			 '<div class="dot"></div>'+
			 '</div>'+
			 '</li>';
		_json.users.forEach( function (user) {
			user = user.replace(/ /g,"_");
			if(user !== typingUser) {
				if(!($('#'+ user +' .chats ul>li').hasClass('pending')))
					$('#'+ user +' .chats ul').append(pending);
			}
		});		
	}
	
	// HELPER FUNCTION
	function getDateTime (t) {
		var month 	= ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];	
		var d 		= new Date(t/1000),
			 month 	= (month[d.getMonth()]),
			 day 		= d.getDate().toString(),
			 hour 	= d.getHours().toString(),
			 min 		= d.getMinutes().toString();
		(day.length < 2) ? day = '0' + day : '';
		(hour.length < 2) ? hour = '0' + hour : '';
		(min.length < 2) ? min = '0' + min : '';		
		var res = ''+month+' '+day+' '+hour+ ':' + min;
		return res;
	}
	
	// KEYPRESS EVENTS HANDLER
	$('#viewport .sendBox>input').keypress(function( e ) {			
		var _id = $(this).closest('.chatbox').attr('id');
		pendingRender(_id);
		if(e.which == 13) {
			var msgFrom;
			_json.users.forEach(function (user) {
				if(user.replace(/ /g,"_") === _id)
					msgFrom = user;
			});
			var msg = $('#'+_id+' .sendBox>input').val();
			msg = msg.replace(/\"/g,'\\"');
			var t = $.now();
			$('#'+_id+' .sendBox>input').val('');
			if(msg.replace(/\s/g, '') !== ''){
				var temp = {
					from: msgFrom,
					msg: msg,
					time: t.toString(),
					action: ''
				}
				_json.chats.push(temp);
				console.log(_json);
				newMsgRender (temp);
			} else {
				$('#viewport .chats ul>li.pending').remove();
			}
		}
	});	
	
	// EVENT HANDLER
	$('#viewport .sendBox>input').focusout(function() {
		$('#viewport .chats ul>li.pending').remove();
	});
});
              
            
!
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