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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.

HTML

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

section#two
	p Slide Two

section#three
	p Slide Three
	
section#four
	p Slide Four
	
section#five
	p Slide Five
            
          
!

CSS

            
              nav
	position fixed
	
	width 100%
	top 0
	left 0
	right 0
	
	background-color white
	
	ul
		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
		
	li
		display inline-block

		padding 5px
		
	a
		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
		
		&:hover
		&:active
		&:focus
			background-color rgba(#B8D6A8, 0.5)
		
		&.active
			background-color rgba(#B8D6A8, 0.5)
		
		
section
	display flex
	align-items center
	justify-content center
	
	min-height 100vh
	
p
	text-align center
	color white
	font-size 3.5em
	font-weight bold
	text-transform uppercase
	
#one
	background-color #6CA392
	
#two
	background-color #FFA58C
	
#three
	background-color #FF4F30
	
#four
	background-color #576B51
	
#five
	background-color #392A1B
            
          
!

JS

            
              // 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
			document.querySelector('.active').classList.remove('active');
			// get id of the intersecting section
			var id = entry.target.getAttribute('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) => {
	observer.observe(section);
});
            
          
!
999px

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