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HTML

              
                #chat-container
	#chat-input
		#file-input
              
            
!

CSS

              
                html,
body {
	background-color: hsl(0, 0%, 8%);
	// margin: 0; // Go fixed
	// font-size: 0; // Fix white-space issues if present.
	// height: 100vh; // Go fixed
	user-select: none;
}

// For centering
#chat-container {
	display: flex;
	justify-content: center;
	align-items: center;
}

#chat-input {
	position: fixed;
	bottom: 10px;
	height: 40px;
	width: 500px;
	background-color: hsl(0, 0%, 14%);
	border-radius: 6px;
	overflow: hidden;
	
	&:before,
	&:after {
		content: '';
		display: block;
		position: absolute;
		top: 12px;
		bottom: 12px;
		background-color: hsla(0, 0%, 22%, 0.4);
	}
	// Chat input
	&:before {
		cursor: text;
		left: 52px;
		width: 40%;
		border-radius: 2px;
	}
	// Emote picker
	&:after {
		cursor: pointer;
		right: 10px;
		width: 16px;
		border-radius: 8px;
	}
	#file-input {
		cursor: pointer;
		display: block;
		border-right: 2px solid hsl(0, 0%, 16%);
		position: absolute;
		top: 2px;
		left: 2px;
		bottom: 2px;
		width: 36px;
		transition: background-color 60ms;
		
		&:hover {
			top: 0;
			left: 0;
			bottom: 0;
			width: 40px;
			background-color: hsl(0, 0%, 28%);
			border-right: 0;
			transition: background-color 120ms;
		}
		&:before,
		&:after {
			content: '';
			display: block;
			position: absolute;
			background-color: hsl(0, 0%, 22%);
		}
		&:before {
			top: 30%;
			bottom: 30%;
			left: 50%;
			width: 2px;
			margin-left: -1px;
		}
		&:after {
			left: 30%;
			right: 30%;
			top: 50%;
			height: 2px;
			margin-top: -1px;
		}
	}
}

.chat {
	position: fixed;
	bottom: 60px;
	width: 500px;
	display: inline-block;
}

.line-container {
	overflow: hidden;
	border-radius: 6px;
	max-height: 0px;
	opacity: 0;
	transform: translateX(-300px) scale(0.2);
	transition: margin-bottom 200ms, max-height 500ms, opacity 100ms, transform 250ms;
	transition-timing-function: ease-out;
	
	
	&:not(:last-child) {
		margin-bottom: 10px;
	}
}

.line {
	padding: 10px;
	background-color: hsl(0, 0%, 14%);
	
	& > div {
		display: inline-block;
		vertical-align: top;
	}
}

.profile-img {
	cursor: pointer;
	border-radius: 6px;
	width: 60px;
	height: 60px;
	background-color: hsl(0, 0%, 22%);
	margin-right: 10px;
}

.body {
	// background-color: black;
	
	.name,
	.text {
		border-radius: 2px;
		background-color: hsl(0, 0%, 28%);
		height: 16px;
	}
}

.name {
	width: 100px;
	margin-bottom: 10px;
	position: relative;
	cursor: pointer;
	
	&:after {
		content: '';
		display: block;
		border-radius: 2px;
		background-color: hsla(0, 0%, 22%, 0.4);
		height: 16px;
		width: 50px;
		position: absolute;
		right: -60px;
		transition: 100ms;
	}
}

.profile-img:hover + .body .name:after,
.name:hover:after {
	background-color: hsla(0, 0%, 22%, 1);
	width: 100px;
	right: -110px;
}

.text {
	&:not(:last-child) {
		margin-bottom: 10px;
	}
}

.img {
}

.rich-body {
	margin-left: 14px;
	margin-top: 36px;
	position: relative;
	
	&:before {
		content: '';
		display: block;
		position: absolute;
		top: -26px;
		left: -14px;
		bottom: 0;
		width: 4px;
		background-color: inherit;
	}
	&:after {
		content: '';
		display: block;
		position: absolute;
		height: 16px;
		width: 200px;
		top: -26px;
		background-color: inherit;
		border-radius: 2px;
	}
}

.img,
.rich-body {
	width: 300px;
	height: 300px;
	cursor: pointer;
	border-radius: 6px;
	background-color: hsl(0, 0%, 20%);
}

.profile-img,
.name,
.text,
.img, 
.rich-body {
	opacity: 0;
	transform: translateY(20px);
	transition: 200ms;
}
              
            
!

JS

              
                let amountOfColors = 18; // Or "participants"

let container = document.getElementById('chat-container');
let lineWidth = 500;
let profileImgWidth = 60;
let textWidth = lineWidth - 20 - profileImgWidth - 10;
let chats = [];
let maxTexts = 4;

function createElement(opts = {}) {
	let ele = document.createElement('div');
	if('class' in opts) {
		if(!Array.isArray(opts.class)) {
			opts.class = [ opts.class ];
		}
		ele.classList.add(...opts.class);
	}
	return ele;
}

function addChat() {
	let chat = new Chat();
	chats.push(chat);
	setTimeout(() => chat.loop(), 200);
	return chat;
}

class Chat {
	constructor() {
		this.ele = createElement({ class: 'chat' });
		this.lines = [];
		this.anim = null;
		container.appendChild(this.ele);
	}
	addLine() {
		let l = new Line();
		this.lines.push(l);
		this.ele.appendChild(l.ele.lineContainer);
		return l;
	}
	removeOldest() {
		let maxCount = Math.ceil(window.innerHeight / 1080 * 12);
		if(this.lines.length > maxCount) {
			let oldest = this.lines.splice(0, this.lines.length - maxCount);
			oldest.forEach(n => this.ele.removeChild(n.ele.lineContainer));
		}
	}
	loop() {
		if(this.anim) {
			this.stopLoop();
		}
		this.addLine();
		this.removeOldest();
		this.anim = setTimeout(() => this.loop(), Math.random() * 1300 + 180);
	}
	stopLoop() {
		clearTimeout(this.anim);
		this.anim = null;
	}
}

class Line {
	constructor() {
		this.pickColor();
		this.pickName();
		this.pickText();
		this.pickHasImg();
		this.pickHasRichBody();
		this.setupElements();
		this.animateIn();
	}
	
	pickColor() {
		this.hue = Math.floor(Math.random() * amountOfColors) * (360 / amountOfColors);
		this.color = `hsl(${this.hue}, 90%, 50%)`;
		this.profileImgColor = `hsl(${this.hue}, 40%, 55%)`;
		return this.hue;
	}
	
	pickName() {
		this.name = Math.max(0.3, Math.random());
	}
	
	pickText() {
		let lengthChoice = Math.random();
		let lengthWeight = 1;
		if(lengthChoice < 0.5) {
			lengthWeight = 0.6;
		}
		else if(lengthChoice < 0.9) {
			lengthWeight = 0.8;
		}
		this.length = Math.max(0.02, lengthChoice * lengthWeight);
		this.textCount = this.length * maxTexts;
	}
	
	pickHasImg() {
		this.hasImg = Math.random() > 0.9;
	}
	
	pickHasRichBody() {
		this.hasRichBody = !this.hasImage && Math.random() > 0.85;
	}
	
	setupElements() {
		let ele = this.createElement();
		this.ele = ele;
		ele.name.style.width = this.name * (textWidth / 2) + 'px';
		ele.texts.forEach((n, i, arr) => {
				let w = textWidth;
				if(i === arr.length - 1) {
					w = Math.max(0.2, (this.textCount - i)) * textWidth;
				}
				n.style.width = w + 'px';
			});
		ele.name.style.backgroundColor = this.color;
		ele.profileImg.style.backgroundColor = this.profileImgColor;
	}
	
	animateIn() {
		let delay = 35; // Some times it won't animate correctly without this
		let ele = this.ele;
		setTimeout(() => {
				ele.lineContainer.style.opacity = 1;
				ele.lineContainer.style.maxHeight = '200px';
				ele.lineContainer.style.transform = 'translateX(0px) scale(1)';
			}, delay);
		
		let otherEleList = [ ele.profileImg, ele.name, ...ele.texts ];
		
		if('img' in ele) {
			otherEleList.push(ele.img);
		}
		else if('richBody' in ele) {
			otherEleList.push(ele.richBody);
		}
		
		delay += 40;
		
		otherEleList.forEach((e, i) => {
			setTimeout(() => {
					e.style.opacity = 1;
					e.style.transform = 'translateY(0px)';
				}, delay += 50);
		});
		
		ele.texts.forEach((n, i, arr) => setTimeout(() => n.style.opacity = 1, 70 * (i + 3) + delay));
	}
	
	createElement() {
		let lineContainer = createElement({ class: 'line-container' });
		let line = createElement({ class: 'line' });
		let profileImg = createElement({ class: 'profile-img' });
		let body = createElement({ class: 'body' });
		let name = createElement({ class: 'name' });
		let texts = [];
		let img = createElement({ class: 'img' });
		let richBody = createElement({ class: 'rich-body' });
		body.appendChild(name);
		for(let i = 0; i < (this.textCount || 1); i++) {
			let text = createElement({ class: 'text' });
			texts.push(text);
			body.appendChild(text);
		}
		line.appendChild(profileImg);
		line.appendChild(body);
		lineContainer.appendChild(line);
		let out = { lineContainer, line, profileImg, body, name, texts };
		this.hasImg && (out.img = img) && body.appendChild(img);
		this.hasRichBody && (out.richBody = richBody) && body.appendChild(richBody);
		return out;
	}
}

function loop() {
	chats.forEach(n => n.loop());
}

function stopLoop() {
	chats.forEach(n => n.stopLoop());
}

(() => addChat())();
              
            
!
999px

Console