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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

              
                <link href='https://fonts.googleapis.com/css?family=Roboto:400,700,400italic' rel='stylesheet' type='text/css'>

<nav class="Quick-navigation">
  <a href="#A" class="Quick-navigation-item">A</a>
  <a href="#B" class="Quick-navigation-item">B</a>
  <a href="#C" class="Quick-navigation-item">C</a>
  <a href="#D" class="Quick-navigation-item">D</a>
  <a href="#E" class="Quick-navigation-item">E</a>
  <div class="Scroll-progress-indicator"></div>
</nav>

<section id="A" class="js-scroll-step">
  <h1>A</h1>
</section>

<section id="B"  class="js-scroll-step">
  <h1>B</h1>
</section>

<section id="C" class="js-scroll-step">
  <h1>C</h1>
</section>

<section id="D" class="js-scroll-step">
  <h1>D</h1>
</section>

<section id="E" class="js-scroll-step">
  <h1>E</h1>
</section>

<button class="Scroll-to-top">Scroll To Top</button>
              
            
!

CSS

              
                html 
  box-sizing border-box

*, *:after, *:before 
  box-sizing inherit

html, body 
  height 100%
  
body
  font-family "Roboto", Helvetica, Arial, sans-serif
  margin 0

h1 
  margin 0
  padding 0

section 
  display flex
  justify-content center
  align-items center
  color rgba(0, 0, 0, 0.5)
  font-size 2rem
  min-height 100%
  height 100vh

.Quick-navigation 
  position fixed
  z-index 1
  margin 0
  top 50%
  right 0
  transform translateY(-50%)


.Quick-navigation-item 
    color rgba(0, 0, 0, 0.4)
    text-decoration none
    font-size 1.3em
    transition color 0.3s
    padding 0.5em
    display block

.Quick-navigation-item:hover
.Quick-navigation-item.current 
  color #FFF

.Scroll-progress-indicator 
  will-change opacity, transform
  transition all 0.5s
  left -10px
  border-radius 2px
  position absolute
  top 50%
  opacity 0
  padding 2em
  transform translateX(200%) translateY(-50%)
  background-color rgba(0, 0, 0, 0.1)


.Scroll-progress-indicator.visible 
  transform translateX(-100%) translateY(-50%)
  opacity 1


#A 
  background-color crimson

#B 
  background-color lighten(crimson, 10%)
  height 600px

#C
  background-color lighten(crimson, 20%)

#D
  background-color lighten(crimson, 30%)
  height 200px

#E
  background-color lighten(crimson, 40%)

.Scroll-to-top 
  position fixed
  right 20px
  bottom 0
  background-color rgba(0, 0, 0, 0.2)
  border none
  color rgba(255, 255, 255, 0.5)
  font-size 1.5rem
  padding 0.5em
  cursor pointer
  opacity  0
  transform translateY(100%)
  transition all 0.3s
  outline none

.Scroll-to-top.visible 
  opacity 1
  transform translateY(0)


.Scroll-to-top:hover 
  color rgba(255, 255, 255, 0.9)

              
            
!

JS

              
                (function () {
		
   //////////////////////
	// Utils
  //////////////////////
    function throttle(fn, delay, scope) {
        // Default delay
        delay = delay || 250;
        var last, defer;
        return function () {
            var context = scope || this,
                now = +new Date(),
                args = arguments;
            if (last && now < last + delay) {
                clearTimeout(defer);
                defer = setTimeout(function () {
                    last = now;
                    fn.apply(context, args);
                }, delay);
            } else {
                last = now;
                fn.apply(context, args);
            }
        }
    }

    function extend(destination, source) {
        for (var k in source) {
            if (source.hasOwnProperty(k)) {
                destination[k] = source[k];
            }
        }
        return destination;
    }
  
   //////////////////////
	// END Utils
  //////////////////////
  
   //////////////////////
   // Scroll Module
   //////////////////////

    var ScrollManager = (function () {

        var defaults = {

                steps: null,
                navigationContainer: null,
                links: null,
                scrollToTopBtn: null,

                navigationElementClass: '.Quick-navigation',
                currentStepClass: 'current',
                smoothScrollEnabled: true,
                stepsCheckEnabled: true,

                // Callbacks
                onScroll: null,

                onStepChange: function (step) {
                    var self = this;
                    var relativeLink = [].filter.call(options.links, function (link) {
                        link.classList.remove(self.currentStepClass);
                        return link.hash === '#' + step.id;
                    });
                    relativeLink[0].classList.add(self.currentStepClass);
                },

                // Provide a default scroll animation
                smoothScrollAnimation: function (target) {
                    $('html, body').animate({
                        scrollTop: target
                    }, 'slow');
                }
            },

            options = {};

        // Privates
        var _animation = null,
            currentStep = null,
            throttledGetScrollPosition = null;

        return {

            scrollPosition: 0,

            init: function (opts) {

                options = extend(defaults, opts);

                if (options.steps === null) {
                    console.warn('Smooth scrolling require some sections or steps to scroll to :)');
                    return false;
                }

                // Allow to customize the animation engine ( jQuery / GSAP / velocity / ... )
                _animation = function (target) {
                    target = typeof target === 'number' ? target : $(target).offset().top;
                    return options.smoothScrollAnimation(target);
                };

                // Activate smooth scrolling
                if (options.smoothScrollEnabled)  this.smoothScroll();

                // Scroll to top handling
                if (options.scrollToTopBtn) {
                    options.scrollToTopBtn.addEventListener('click', function () {
                        options.smoothScrollAnimation(0);
                    });
                }

                // Throttle for performances gain
                throttledGetScrollPosition = throttle(this.getScrollPosition).bind(this);
                window.addEventListener('scroll', throttledGetScrollPosition);
                window.addEventListener('resize', throttledGetScrollPosition);

                this.getScrollPosition();
            },

            getScrollPosition: function () {
                this.scrollPosition = window.pageYOffset || window.scrollY;
                if (options.stepsCheckEnabled) this.checkActiveStep();
                if (typeof  options.onScroll === 'function') options.onScroll(this.scrollPosition);
            },

            scrollPercentage: function () {
                var body = document.body,
                    html = document.documentElement,
                    documentHeight = Math.max(body.scrollHeight, body.offsetHeight,
                        html.clientHeight, html.scrollHeight, html.offsetHeight);

                var percentage = Math.round(this.scrollPosition / (documentHeight - window.innerHeight) * 100);
                if (percentage < 0)  percentage = 0;
                if (percentage > 100)  percentage = 100;
                return percentage;
            },

            doSmoothScroll: function (e) {
                if (e.target.nodeName === 'A') {
                    e.preventDefault();
                    if (location.pathname.replace(/^\//, '') === e.target.pathname.replace(/^\//, '') && location.hostname === e.target.hostname) {
                        var targetStep = document.querySelector(e.target.hash);
                        targetStep ? _animation(targetStep) : console.warn('Hi! You should give an animation callback function to the Scroller module! :)');
                    }
                }
            },

            smoothScroll: function () {
                if (options.navigationContainer !== null) options.navigationContainer.addEventListener('click', this.doSmoothScroll);
            },

            checkActiveStep: function () {
                var scrollPosition = this.scrollPosition;

                [].forEach.call(options.steps, function (step) {
                    var bBox = step.getBoundingClientRect(),
                        position = step.offsetTop,
                        height = position + bBox.height;

                    if (scrollPosition >= position && scrollPosition < height && currentStep !== step) {
                        currentStep = step;
                        step.classList.add(self.currentStepClass);
                        if (typeof options.onStepChange === 'function') options.onStepChange(step);
                    }
                    step.classList.remove(options.currentStepClass);
                });
            },

            destroy: function () {
                window.removeEventListener('scroll', throttledGetScrollPosition);
                window.removeEventListener('resize', throttledGetScrollPosition);
                options.navigationContainer.removeEventListener('click', this.doSmoothScroll);
            }
        }
    })();
     //////////////////////
     // END scroll Module
     //////////////////////
  
  
    //////////////////////
    // APP init
    //////////////////////

    var scrollToTopBtn = document.querySelector('.Scroll-to-top'),
        steps = document.querySelectorAll('.js-scroll-step'),
        navigationContainer = document.querySelector('.Quick-navigation'),
        links = navigationContainer.querySelectorAll('a'),
        progressIndicator = document.querySelector('.Scroll-progress-indicator');

    ScrollManager.init({
        steps: steps,
        scrollToTopBtn: scrollToTopBtn,
        navigationContainer: navigationContainer,
        links: links,
      
        // Customize onScroll behavior
        onScroll: function () {
            var percentage = ScrollManager.scrollPercentage();
            percentage >= 90 ? scrollToTopBtn.classList.add('visible') : scrollToTopBtn.classList.remove('visible');

            if (percentage >= 10) {
                progressIndicator.innerHTML = percentage + "%";
                progressIndicator.classList.add('visible');
            } else {
                progressIndicator.classList.remove('visible');
            }
        },
      
		// Behavior when a step changes
		// default : highlight links 
      
		// onStepChange: function (step) {},
      
		// Customize the animation with jQuery, GSAP or velocity 
     // default : jQuery animate()
     // Eg with GSAP scrollTo plugin
      
		//smoothScrollAnimation: function (target) {
		//		TweenLite.to(window, 2, {scrollTo:{y:target}, ease:Power2.easeOut});
  	 //}
      
    });
  
    //////////////////////
    // END APP init
    //////////////////////

})();
              
            
!
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