Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <svg display="none">
	<symbol id="clock" viewBox="0 0 32 32" >
		<circle r="15" cx="16" cy="16" fill="none" stroke="currentColor" stroke-width="2" />
		<polyline points="16,7 16,16 23,16" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
	</symbol>
	<symbol id="error" viewBox="0 0 32 32" >
		<circle r="15" cx="16" cy="16" fill="none" stroke="hsl(13,90%,55%)" stroke-width="2" />
		<line x1="10" y1="10" x2="22" y2="22" stroke="hsl(13,90%,55%)" stroke-width="2" stroke-linecap="round" />
		<line x1="22" y1="10" x2="10" y2="22" stroke="hsl(13,90%,55%)" stroke-width="2" stroke-linecap="round" />
	</symbol>
	<symbol id="message" viewBox="0 0 32 32" >
		<polygon points="1,6 31,6 31,26 1,26" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
		<polyline points="1,6 16,18 31,6" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
	</symbol>
	<symbol id="success" viewBox="0 0 32 32" >
		<circle r="15" cx="16" cy="16" fill="none" stroke="hsl(93,90%,40%)" stroke-width="2" />
		<polyline points="9,18 13,22 23,12" fill="none" stroke="hsl(93,90%,40%)" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
	</symbol>
	<symbol id="up" viewBox="0 0 32 32" >
		<circle r="15" cx="16" cy="16" fill="none" stroke="currentColor" stroke-width="2" />
		<polyline points="11,15 16,10 21,15" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
		<line x1="16" y1="10" x2="16" y2="22" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
	</symbol>
	<symbol id="warning" viewBox="0 0 32 32" >
		<polygon points="16,1 31,31 1,31" fill="none" stroke="hsl(33,90%,55%)" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
		<line x1="16" y1="12" x2="16" y2="20" stroke="hsl(33,90%,55%)" stroke-width="2" stroke-linecap="round" />
		<line x1="16" y1="25" x2="16" y2="25" stroke="hsl(33,90%,55%)" stroke-width="3" stroke-linecap="round" />
	</symbol>
</svg>
              
            
!

CSS

              
                * {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root {
	--hue: 223;
	--bg: hsl(var(--hue),10%,90%);
	--fg: hsl(var(--hue),10%,10%);
	--transDur: 0.15s;
	font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320));
}
body,
button {
	color: var(--fg);
	font: 1em/1.5 "DM Sans", "Helvetica Neue", Helvetica, sans-serif;
}
body {
	background-color: var(--bg);
	height: 100vh;
	display: grid;
	place-items: center;
	transition: background-color var(--transDur);
}
.notification {
	padding-bottom: 0.75em;
	position: fixed;
	top: 1.5em;
	right: 1.5em;
	width: 18.75em;
	max-width: calc(100% - 3em);
	transition: transform 0.15s ease-out;
	-webkit-user-select: none;
	-moz-user-select: none;
	user-select: none;
}
.notification__box,
.notification__content,
.notification__btns {
	display: flex;
}
.notification__box,
.notification__content {
	align-items: center;
}
.notification__box {
	animation: flyIn 0.3s ease-out;
	background-color: hsl(0,0%,100%);
	border-radius: 0.75em;
	box-shadow: 0 0.5em 1em hsla(var(--hue),10%,10%,0.1);
	height: 4em;
	transition:
		background-color var(--transDur),
		color var(--transDur);
}
.notification--out .notification__box {
	animation: flyOut 0.3s ease-out forwards;
}
.notification__content {
	padding: 0.375em 1em;
	width: 100%;
	height: 100%;
}
.notification__icon {
	flex-shrink: 0;
	margin-right: 0.75em;
	width: 2em;
	height: 2em;
}
.notification__icon-svg {
	width: 100%;
	height: auto;
}
.notification__text {
	line-height: 1.333;
}
.notification__text-title {
	font-size: 0.75em;
	font-weight: bold;
}
.notification__text-subtitle {
	font-size: 0.6em;
	opacity: 0.75;
}
.notification__btns {
	box-shadow: -1px 0 0 hsla(var(--hue),10%,10%,0.15);
	flex-direction: column;
	flex-shrink: 0;
	min-width: 4em;
	height: 100%;
	transition: box-shadow var(--transDur);
}
.notification__btn {
	background-color: transparent;
	box-shadow: 0 0 0 hsla(var(--hue),10%,10%,0.5) inset;
	font-size: 0.6em;
	line-height: 1;
	font-weight: 500;
	height: 100%;
	padding: 0 0.5rem;
	transition:
		background-color var(--transDur),
		color var(--transDur);
	-webkit-appearance: none;
	appearance: none;
	-webkit-tap-highlight-color: transparent;
}
.notification__btn-text {
	display: inline-block;
	pointer-events: none;
}
.notification__btn:first-of-type {
	border-radius: 0 0.75rem 0 0;
}
.notification__btn:last-of-type {
	border-radius: 0 0 0.75rem 0;
}
.notification__btn:only-child {
	border-radius: 0 0.75rem 0.75rem 0;
}
.notification__btn + .notification__btn {
	box-shadow: 0 -1px 0 hsla(var(--hue),10%,10%,0.15);
	font-weight: 400;
}
.notification__btn:active,
.notification__btn:focus {
	background-color: hsl(var(--hue),10%,95%);
}
.notification__btn:focus {
	outline: transparent;
}

@supports selector(:focus-visible) {
	.notification__btn:focus {
		background-color: transparent;
	}
	.notification__btn:focus-visible,
	.notification__btn:active {
		background-color: hsl(var(--hue),10%,95%);
	}
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
	:root {
		--bg: hsl(var(--hue),10%,10%);
		--fg: hsl(var(--hue),10%,90%);
	}
	.notification__box {
		background-color: hsl(var(--hue),10%,30%);
	}
	.notification__btns {
		box-shadow: -1px 0 0 hsla(var(--hue),10%,90%,0.15);
	}
	.notification__btn + .notification__btn {
		box-shadow: 0 -1px 0 hsla(var(--hue),10%,90%,0.15);
	}
	.notification__btn:active,
	.notification__btn:focus {
		background-color: hsl(var(--hue),10%,35%);
	}

	@supports selector(:focus-visible) {
		.notification__btn:focus {
			background-color: transparent;
		}
		.notification__btn:focus-visible,
		.notification__btn:active {
			background-color: hsl(var(--hue),10%,35%);
		}
	}
}

/* Animations */
@keyframes flyIn {
	from {
		transform: translateX(calc(100% + 1.5em));
	}
	to {
		transform: translateX(0);
	}
}
@keyframes flyOut {
	from {
		transform: translateX(0);
	}
	to {
		transform: translateX(calc(100% + 1.5em));
	}
}
              
            
!

JS

              
                window.addEventListener("DOMContentLoaded",() => {
	const nc = new NotificationCenter();
});

class NotificationCenter {
	constructor() {
		this.items = [];
		this.itemsToKill = [];
		this.messages = NotificationMessages();
		this.killTimeout = null;

		this.spawnNotes(3);
	}
	spawnNote() {
		const id = this.random(0,2**32,true).toString(16);
		const draw = this.random(0,this.messages.length - 1,true);
		const message = this.messages[draw];
		const note = new Notification({
			id: `note-${id}`,
			icon: message.icon,
			title: message.title,
			subtitle: message.subtitle,
			actions: message.actions
		});
		const transY = 100 * this.items.length;

		note.el.style.transform = `translateY(${transY}%)`;
		note.el.addEventListener("click",this.killNote.bind(this,note.id));

		this.items.push(note);
	}
	spawnNotes(amount) {
		let count = typeof amount === "number" ? amount : this.random(1,5,true);

		while (count--)
			this.spawnNote();
	}
	killNote(id,e) {
		const note = this.items.find(item => item.id === id);
		const tar = e.target;

		if (note && tar.getAttribute("data-dismiss") === id) {
			note.el.classList.add("notification--out");
			this.itemsToKill.push(note);

			clearTimeout(this.killTimeout);

			this.killTimeout = setTimeout(() => {
				this.itemsToKill.forEach(itemToKill => {
					document.body.removeChild(itemToKill.el);

					const left = this.items.filter(item => item.id !== itemToKill.id);
					this.items = [...left];
				});

				this.itemsToKill = [];

				if (!this.items.length)
					this.spawnNotes();
				else
					this.spawnNotes(this.random(0,1,true));

				this.shiftNotes();
			},note.killTime);
		}
	}
	shiftNotes() {
		this.items.forEach((item,i) => {
			const transY = 100 * i;
			item.el.style.transform = `translateY(${transY}%)`;
		});
	}
	random(min,max,round = false) {
		const percent = crypto.getRandomValues(new Uint32Array(1))[0] / 2**32;
		const relativeValue = (max - min) * percent;

		return min + (round === true ? Math.round(relativeValue) : +relativeValue.toFixed(2));
	}
}

class Notification {
	constructor(args) {
		this.args = args;
		this.el = null;
		this.id = null;
		this.killTime = 300;
		this.init(args);
	}
	init(args) {
		const {id,icon,title,subtitle,actions} = args;
		const block = "notification";
		const parent = document.body;
		const xmlnsSVG = "http://www.w3.org/2000/svg";
		const xmlnsUse = "http://www.w3.org/1999/xlink";

		const note = this.newEl("div");
		note.id = id;
		note.className = block;
		parent.insertBefore(note,parent.lastElementChild);

		const box = this.newEl("div");
		box.className = `${block}__box`;
		note.appendChild(box);

		const content = this.newEl("div");
		content.className = `${block}__content`;
		box.appendChild(content);

		const _icon = this.newEl("div");
		_icon.className = `${block}__icon`;
		content.appendChild(_icon);

		const iconSVG = this.newEl("svg",xmlnsSVG);
		iconSVG.setAttribute("class",`${block}__icon-svg`);
		iconSVG.setAttribute("role","img");
		iconSVG.setAttribute("aria-label",icon);
		iconSVG.setAttribute("width","32px");
		iconSVG.setAttribute("height","32px");
		_icon.appendChild(iconSVG);

		const iconUse = this.newEl("use",xmlnsSVG);
		iconUse.setAttributeNS(xmlnsUse,"href",`#${icon}`);
		iconSVG.appendChild(iconUse);

		const text = this.newEl("div");
		text.className = `${block}__text`;
		content.appendChild(text);

		const _title = this.newEl("div");
		_title.className = `${block}__text-title`;
		_title.textContent = title;
		text.appendChild(_title);

		if (subtitle) {
			const _subtitle = this.newEl("div");
			_subtitle.className = `${block}__text-subtitle`;
			_subtitle.textContent = subtitle;
			text.appendChild(_subtitle);
		}

		const btns = this.newEl("div");
		btns.className = `${block}__btns`;
		box.appendChild(btns);

		actions.forEach(action => {
			const btn = this.newEl("button");
			btn.className = `${block}__btn`;
			btn.type = "button";
			btn.setAttribute("data-dismiss",id);

			const btnText = this.newEl("span");
			btnText.className = `${block}__btn-text`;
			btnText.textContent = action;

			btn.appendChild(btnText);
			btns.appendChild(btn);
		});

		this.el = note;
		this.id = note.id;
	}
	newEl(elName,NSValue) {
		if (NSValue)
			return document.createElementNS(NSValue,elName);
		else
			return document.createElement(elName);
	}
}

function NotificationMessages() {
	return [
		{
			icon: "error",
			title: "Oh No",
			subtitle: "Something really bad happened.",
			actions: ["Close"]
		},
		{
			icon: "error",
			title: "Error",
			subtitle: "The operation completed successfully.",
			actions: ["OK"]
		},
		{
			icon: "error",
			title: "Critical Error",
			subtitle: "An error has occurred while trying to display an error notification.",
			actions: ["OK"]
		},
		{
			icon: "warning",
			title: "Reminder",
			subtitle: "You will receive more notifications.",
			actions: ["Close"]
		},
		{
			icon: "warning",
			title: "Failed to Save Changes",
			actions: ["Retry","Cancel"]
		},
		{
			icon: "warning",
			title: "Download Failed",
			actions: ["Retry","Cancel"]
		},
		{
			icon: "warning",
			title: "Cannot Send Mail",
			subtitle: "The message was rejected by the server because it is too large.",
			actions: ["OK"]
		},
		{
			icon: "warning",
			title: "Disk Not Ejected Properly",
			subtitle: "Eject “CopyThisFloppy” before disconnecting or turning it off.",
			actions: ["Close"]
		},
		{
			icon: "warning",
			title: "Notifications",
			subtitle: "Notifications may include alerts, sounds, and icon badges.",
			actions: ["Don’t Allow","Allow"]
		},
		{
			icon: "success",
			title: "Changes Saved",
			actions: ["OK"]
		},
		{
			icon: "success",
			title: "Download Complete",
			actions: ["OK"]
		},
		{
			icon: "success",
			title: "Yippee",
			subtitle: "Nothing bad happened.",
			actions: ["OK"]
		},
		{
			icon: "message",
			title: "Mail Password Required",
			subtitle: "Enter your password for user@domain.com.",
			actions: ["Close","Continue"]
		},
		{
			icon: "message",
			title: "Mail",
			subtitle: "You have 10 new messages.",
			actions: ["Read","Dismiss"]
		},
		{
			icon: "clock",
			title: "Coffee Break",
			subtitle: "In 5 minutes",
			actions: ["Close","Snooze"]
		},
		{
			icon: "clock",
			title: "Muffin Time",
			subtitle: "12:30 PM",
			actions: ["Close","Snooze"]
		},
		{
			icon: "clock",
			title: "Hammer Time",
			subtitle: "In 2 minutes",
			actions: ["Close","Snooze"]
		},
		{
			icon: "up",
			title: "Upgrade Available",
			subtitle: "Enjoy the latest technologies and refinements to your favorite apps.",
			actions: ["Install","Details"]
		},
		{
			icon: "up",
			title: "Upgrade Waiting",
			subtitle: "Get it now, or it won’t be long until you are far behind everyone else.",
			actions: ["Install","Details"]
		},
		{
			icon: "up",
			title: "Upgrade Now",
			subtitle: "The current version will soon be obsolete. What are you waiting for?",
			actions: ["Install","Details"]
		}
	];
}
              
            
!
999px

Console