<div class="section">     
    <div class="center-wrap">     
      <h1 class="text-center">Scroll</h1>
      <p class="text-center mb-0">Look at the right bottom corner<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>  
  

                  
  <div class="switch">
    <div class="circle"></div>
  </div>  
                
  <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>

/* Please ❤ this if you like it! */



@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);