<div class="section">			
		<div class="center-wrap">			
			<h1 class="text-center">Scroll</h1>
			<p class="text-center mb-0">Ver abajo a la derecha<span class="color-gradient-red-yellow"><i class="uil uil-chart-down size-22 ml-2"></i></span></p>
		</div>
	</div>				
	<div class="section">
	</div>				
	<div class="section">
	</div>	
	
	<a class="navbar-brand" href="https://front.codes" target="_blank">
		<img src="https://www.sessionstudio.com.ar/wp-content/uploads/2018/09/diseno-web.png" alt="Diseño web Sessionstudio">
	</a>
																	
	<div class="progress-wrap">
		<svg class="progress-circle svg-content" width="100%" height="100%" viewBox="-1 -1 102 102">
			<path d="M50,1 a49,49 0 0,1 0,98 a49,49 0 0,1 0,-98"/>
		</svg>
	</div>
@import url('https://fonts.googleapis.com/css?family=Muli:200,200i,300,300i,400,400i,600,600i,700,700i,800,800i,900,900i&subset=latin-ext,vietnamese');
@import url('https://fonts.googleapis.com/css?family=Raleway:100,100i,200,200i,300,300i,400,400i,500,500i,600,600i,700,700i,800,800i,900,900i&subset=latin-ext');



:root {
	font-size: 20px;
	--red: #da2c4d;
	--yellow: #f8ab37;
	--green: #2ecc71;
	--white: #ffffff;
	--grey-light: #f2f7f9;
	--grey: #ecedf3;
	--black: #080808;
	--black-blue: #1f2029;
	--black-blue-light: #353746;
	--black-blue-light-2: #404255;
	--black-blue-light-3: #4b4d64;
	--black-light: #424455;
}
body{
    font-family: 'Raleway', sans-serif;
	font-size: 16px;
	font-weight: 500;
	line-height: 1.65;
	color: var(--grey);
	background-color: var(--black-blue);
	overflow-x: hidden;
	letter-spacing: 0.2px;
	-webkit-transition: all 200ms linear;
	transition: all 200ms linear; 
	text-rendering: optimizeLegibility !important;
	-webkit-font-smoothing: antialiased !important;
}
body.light{
	color: var(--black-light);
}
h1{
    font-family: 'Muli', sans-serif;
	font-size: 12vw;
	font-weight: 900;
	line-height: 1;
	color: var(--white);
	-webkit-transition: all 200ms linear;
	transition: all 200ms linear; 
}
body.light h1{
	color: var(--black);
}
body.light{
	background-color: var(--white);
}
.navbar-brand{
	height: 55px;
	position: fixed;
	top: 50px;
	left: 70px;
	z-index: 3333;
	width: auto;
	display: inline-block;
	margin: 0;
	padding: 0;
	-webkit-transition : all 0.3s ease-out;
	transition : all 0.3s ease-out;
}
.navbar-brand::before{
	position: absolute;
	content: '';
	top: -13px;
	left: 50%;
	width: 80px;
	transform: translateX(-50%);
	height: calc(100% + 26px);
	opacity: 0;
	z-index: -1;
	background-image: linear-gradient(260deg, var(--grey), var(--grey-light));
	animation: border-transform 10s linear infinite alternate forwards;
	-webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.navbar-brand::after{
	position: absolute;
	content: '';
	top: -13px;
	left: 50%;
	width: 80px;
	transform: translateX(-50%);
	height: calc(100% + 26px);
	opacity: 1;
	z-index: -1;
	background-image: linear-gradient(160deg, var(--black-blue-light-3), var(--black-blue-light));
	animation: border-transform 10s linear infinite alternate forwards;
	-webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.navbar-brand img{
	padding: 7px 0;
	height: 100%;
	width: auto;
	display: block;
	-webkit-transition : all 0.3s ease-out;
	transition : all 0.3s ease-out;
}
@-webkit-keyframes border-transform{
    0%,100% { border-radius: 63% 37% 54% 46% / 55% 48% 52% 45%; } 
	14% { border-radius: 40% 60% 54% 46% / 49% 60% 40% 51%; } 
	28% { border-radius: 54% 46% 38% 62% / 49% 70% 30% 51%; } 
	42% { border-radius: 61% 39% 55% 45% / 61% 38% 62% 39%; } 
	56% { border-radius: 61% 39% 67% 33% / 70% 50% 50% 30%; } 
	70% { border-radius: 50% 50% 34% 66% / 56% 68% 32% 44%; } 
	84% { border-radius: 46% 54% 50% 50% / 35% 61% 39% 65%; } 
}
@keyframes border-transform{
    0%,100% { border-radius: 63% 37% 54% 46% / 55% 48% 52% 45%; } 
	14% { border-radius: 40% 60% 54% 46% / 49% 60% 40% 51%; } 
	28% { border-radius: 54% 46% 38% 62% / 49% 70% 30% 51%; } 
	42% { border-radius: 61% 39% 55% 45% / 61% 38% 62% 39%; } 
	56% { border-radius: 61% 39% 67% 33% / 70% 50% 50% 30%; } 
	70% { border-radius: 50% 50% 34% 66% / 56% 68% 32% 44%; } 
	84% { border-radius: 46% 54% 50% 50% / 35% 61% 39% 65%; } 
}
body.light .navbar-brand::before{
	opacity: 1;
}
body.light .navbar-brand::after{
	opacity: 0;
}

.section {
    position: relative;
	width: 100%;
	display: block;
	overflow: hidden;
	height: 100vh;
}
.center-wrap {
    position: absolute;
	width: 100%;
	display: block;
	overflow: hidden;
	left: 0;
	top: 50%;
	transform: translateY(-50%);
	z-index: 2;
}
.color-gradient-red-yellow {
	background: linear-gradient(160deg, var(--red), var(--yellow));
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
}
.color-gradient-red-yellow .uil:before {
	background: linear-gradient(160deg, var(--red), var(--yellow));
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
}
.size-22 {
	font-size: 22px;
}

/* #Progress
================================================== */

.progress-wrap {
	position: fixed;
	right: 50px;
	bottom: 50px;
	height: 46px;
	width: 46px;
	cursor: pointer;
	display: block;
	border-radius: 50px;
	box-shadow: inset  0 0 0 2px rgba(255,255,255,0.2);
	z-index: 10000;
	opacity: 0;
	visibility: hidden;
	transform: translateY(15px);
	-webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.progress-wrap.active-progress {
	opacity: 1;
	visibility: visible;
	transform: translateY(0);
}
.progress-wrap::after {
	position: absolute;
	font-family: 'unicons';
	content: '\e84b';
	text-align: center;
	line-height: 46px;
	font-size: 24px;
	color: var(--grey);
	left: 0;
	top: 0;
	height: 46px;
	width: 46px;
	cursor: pointer;
	display: block;
	z-index: 1;
	-webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.progress-wrap:hover::after {
	opacity: 0;
}
.progress-wrap::before {
	position: absolute;
	font-family: 'unicons';
	content: '\e84b';
	text-align: center;
	line-height: 46px;
	font-size: 24px;
	opacity: 0;
	background-image: linear-gradient(298deg, var(--red), var(--yellow));
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	left: 0;
	top: 0;
	height: 46px;
	width: 46px;
	cursor: pointer;
	display: block;
	z-index: 2;
	-webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.progress-wrap:hover::before {
	opacity: 1;
}
.progress-wrap svg path { 
	fill: none; 
}
.progress-wrap svg.progress-circle path {
	stroke: var(--grey);
	stroke-width: 4;
	box-sizing:border-box;
	-webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
body.light .progress-wrap {
	box-shadow: inset  0 0 0 2px rgba(0,0,0,0.2);
}
body.light .progress-wrap::after {
	color: var(--black-blue);
}
body.light .progress-wrap svg.progress-circle path {
	stroke: var(--black-blue);
}
.switch,
.circle {
	-webkit-transition: all 300ms linear;
	transition: all 300ms linear; 
} 
.switch {
	width: 80px;
	height: 4px;
	border-radius: 27px;
	background-image: linear-gradient(298deg, var(--red), var(--yellow));
	position: fixed;
	right: 50px;
	top: 75px;
	display: block;
	margin: 0 auto;
	text-align: center;
	opacity: 1;
  z-index: 33333;
    transition: all 300ms linear;
}
.circle {
	cursor: pointer;
	position: absolute;
	top: 50%;
	transform: translateY(-50%);
	left: -5px;
	width: 40px;
	height: 40px;
	border-radius: 50%;
	background: var(--black-blue-light-3);
	box-shadow: 0 4px 4px rgba(26,53,71,0.25), 0 0 0 1px rgba(26,53,71,0.07);
	animation: border-transform 10s linear infinite alternate forwards;
}
.circle:hover {
	box-shadow: 0 8px 8px rgba(26,53,71,0.25), 0 0 0 1px rgba(26,53,71,0.07);
}
.circle:before {
	position: absolute;
	font-family: 'unicons';
	content: '\eac1';
	top: 0;
	left: 0;
	z-index: 2;
	font-size: 20px;
	line-height: 40px;
	text-align: center;
	width: 100%;
	height: 40px;
	opacity: 1;
	color: var(--grey);
	-webkit-transition: all 300ms linear;
	transition: all 300ms linear; 
}
.circle:after {
	position: absolute;
	font-family: 'unicons';
	content: '\eb8f';
	top: 0;
	left: 0;
	z-index: 2;
	font-size: 20px;
	line-height: 40px;
	text-align: center;
	width: 100%;
	height: 40px;
	color: var(--yellow);
	opacity: 0;
	-webkit-transition: all 300ms linear;
	transition: all 300ms linear; 
}
.switched {
}
.switched .circle {
	left: 45px;
	box-shadow: 0 4px 4px rgba(26,53,71,0.25), 0 0 0 1px rgba(26,53,71,0.07);
	background: var(--black-blue);
}
.switched .circle:hover {
	box-shadow: 0 8px 8px rgba(26,53,71,0.25), 0 0 0 1px rgba(26,53,71,0.07);
}
.switched .circle:before {
	opacity: 0;
}
.switched .circle:after {
	opacity: 1;
}


/* Please ❤ this if you like it! */



(function($) { "use strict";

	//Switch dark/light
	
	$(".switch").on('click', function () {
		if ($("body").hasClass("light")) {
			$("body").removeClass("light");
			$(".switch").removeClass("switched");
		}
		else {
			$("body").addClass("light");
			$(".switch").addClass("switched");
		}
	});
		
	$(document).ready(function(){"use strict";
	
		//Scroll back to top
		
		var progressPath = document.querySelector('.progress-wrap path');
		var pathLength = progressPath.getTotalLength();
		progressPath.style.transition = progressPath.style.WebkitTransition = 'none';
		progressPath.style.strokeDasharray = pathLength + ' ' + pathLength;
		progressPath.style.strokeDashoffset = pathLength;
		progressPath.getBoundingClientRect();
		progressPath.style.transition = progressPath.style.WebkitTransition = 'stroke-dashoffset 10ms linear';		
		var updateProgress = function () {
			var scroll = $(window).scrollTop();
			var height = $(document).height() - $(window).height();
			var progress = pathLength - (scroll * pathLength / height);
			progressPath.style.strokeDashoffset = progress;
		}
		updateProgress();
		$(window).scroll(updateProgress);	
		var offset = 50;
		var duration = 550;
		jQuery(window).on('scroll', function() {
			if (jQuery(this).scrollTop() > offset) {
				jQuery('.progress-wrap').addClass('active-progress');
			} else {
				jQuery('.progress-wrap').removeClass('active-progress');
			}
		});				
		jQuery('.progress-wrap').on('click', function(event) {
			event.preventDefault();
			jQuery('html, body').animate({scrollTop: 0}, duration);
			return false;
		})
		
		
	});
	
})(jQuery); 

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css
  2. https://s3-us-west-2.amazonaws.com/s.cdpn.io/1462889/unicons.css

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.0/jquery.min.js