Pen Settings

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. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation


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.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

			a(href='#one').active One
			a(href='#two') Two
			a(href='#three') Three
			a(href='#four') Four
			a(href='#five') Five
	p Slide One

	p Slide Two

	p Slide Three
	p Slide Four
	p Slide Five
	position fixed
	width 100%
	top 0
	left 0
	right 0
	background-color white
		list-style-type none
		display flex
		align-items center
		justify-content space-around
		width 100%
		max-width 800px
		height 50px
		margin 0 auto
		padding 0
		display inline-block

		padding 5px
		display block

		height 40px
		padding 0 20px
		line-height 40px
		text-decoration none
		text-transform uppercase
		color #323232
		font-weight bold
		border-radius 4px
		transition background-color 0.3s ease-in
			background-color rgba(#B8D6A8, 0.5)
			background-color rgba(#B8D6A8, 0.5)
	display flex
	align-items center
	justify-content center
	min-height 100vh
	text-align center
	color white
	font-size 3.5em
	font-weight bold
	text-transform uppercase
	background-color #6CA392
	background-color #FFA58C
	background-color #FF4F30
	background-color #576B51
	background-color #392A1B
              // simple function to use for callback in the intersection observer
const changeNav = (entries, observer) => {
	entries.forEach((entry) => {
		// verify the element is intersecting
		if(entry.isIntersecting && entry.intersectionRatio >= 0.55) {
			// remove old active class
			// get id of the intersecting section
			var id ='id');
			// find matching link & add appropriate class
			var newLink = document.querySelector(`[href="#${id}"]`).classList.add('active');

// init the observer
const options = {
	threshold: 0.55

const observer = new IntersectionObserver(changeNav, options);

// target the elements to be observed
const sections = document.querySelectorAll('section');
sections.forEach((section) => {
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.