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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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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.

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HTML 

              
                #wrapper
 .card.card1
  .content
   .inner
   %h1.word This
   %h3{"data-text" => "02"} 02
   %p Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Aenean posuere, tortor sed cursus feugiat, nunc augue blandit nunc.
 .card.card2
  .content
   .inner
   %h1.word Check
   %h3{"data-text" => "01"} 01
   %p Nulla consequat massa quis enim. Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus. In ac felis quis tortor malesuada pretium.
 .card.card3
  .content
   .inner
   %h1.word Out
   %h3{"data-text" => "04"} 04
   %p Nullam accumsan lorem in dui. Donec vitae orci sed dolor rutrum auctor. Curabitur vestibulum aliquam leo.
 .card.card4
  .content
   .inner
   %h1.word Thing
   %h3{"data-text" => "03"} 03
   %p Fusce risus nisl, viverra et, tempor et, pretium in, sapien. In hac habitasse platea dictumst. Nam adipiscing.
 #trigger
!

CSS 

              
                
body{
  display:flex;
  justify-content:center;
  align-items:center;
  height:100vh;
  background:radial-gradient(circle at center, #555, #222);
  font-family:'Acme';
  perspective:600px;
  *{
    transform-style:preserve-3d;
    backface-visibility:hidden;
    &:before, &:after{
      transform-style:preserve-3d;
      backface-visibility:hidden;
    }
  }
  #wrapper{
    width:700px;
    height:500px;
    position:relative;
    overflow:hidden;
    box-shadow:0 20px 40px -10px rgba(0,0,0,0.25);
    &.flash{
      animation:bend 2s cubic-bezier(0.175, 0.885, 0.32, 1.275) 1 forwards;
      @keyframes bend{
        0%{
          transform:rotateY(0deg);
        }
        20%{
          transform:rotateY(2.5deg);
        }
        50%{
          transform:rotateY(0deg);
        }
        100%{
          transform:rotateY(0deg);
        }
      }
    }
    #trigger{
      position:absolute;
      width:20px;
      height:20px;
      box-shadow:0 0 0 1px #ccc, 0 0 0 1px #ccc;
      z-index:999;
      border-radius:100%;
      left:calc(12.5% - 12.5px);
      top:calc(50% - 12.5px);
      transition:background 0.2s ease-in-out, opacity 0.2s ease-in-out;
      cursor:pointer;
      &:hover{
        background:#ccc;
        &:before{
          color:#222;
        }
      }
      &.flash{
        transition:box-shadow 0.2s ease-in-out, opacity 0.2s ease-in-out;
        transition-delay:0s, 0.2s;
        box-shadow:0 0 0 1px #ccc, 0 0 0 10px transparent;
        opacity:0;
        pointer-events:none;
      }
      &:before{
        content:'→';
        position:absolute;
        color:#ccc;
        top:50%;
        left:50%;
        transform:translate(-50%, -50%);
        transition:0.2s ease-in-out;
      }
    }
    &.fade{
      opacity:0.25;
    }
    .card{
      width:100%;
      height:100%;
      position:absolute;
      top:0;
      pointer-events:none;
      z-index:0;
      transition:transform 0.4s ease-in-out;
      .content{
        width:100%;
        height:100%;
        position:absolute;
        left:0;
        top:0;
        overflow:hidden;
        background:linear-gradient(to bottom, transparent calc(50% - 1px), rgba(0,0,0,0.05) calc(50% - 1px), rgba(0,0,0,0.05) 50%, transparent 50%), linear-gradient(to right, transparent calc(56% - 1px), rgba(0,0,0,0.05) calc(56% - 1px), rgba(0,0,0,0.05) 56%, transparent 56%), #ccc;
        background-size:100%, 100% 50%, 100%;
        background-repeat:no-repeat;
        background-position:50%, 50% 100%, 50%;
        h1{
          opacity:1;
          position:absolute;
          left:calc(25% + 40px);
          top:20px;
          font-size:120px;
          margin:0px;
          color:rgba(0,0,0,0.175);
          text-transform:uppercase;
        }
        p{
          position:absolute;
          width:22.5%;
          height:40%;
          display:inline-block;
          bottom:0;
          left:calc(25% + 40px);
          line-height:1.5;
          font-family:"Montserrat";
          font-size:14px;
          color:#555;
          padding:5px;
          box-sizing:border-box;
          transition:0.3s ease-in-out;
          clip-path: polygon(0 0, 0 0, 0 100%, 0% 100%);
        }
        h3{
          position:absolute;
          right:-200px;
          top:20px;
          font-size:80px;
          margin:0;
          color:transparent;
          overflow:hidden;
          border-bottom:1px solid rgba(0,0,0,0.175);
          transform:scaleX(0);
          transform-origin:left;
          transition:transform 0s ease-in-out, right 0.4s ease-in-out;
          transition-delay:0.6s, 0s;
          padding:0 10px;
          &:before{
            content:attr(data-text);
            color:transparent;
            -webkit-text-stroke:0.25px rgba(0,0,0,0.25);
            position:absolute;
            transform:translateY(125%) skewY(45deg);
            transition:0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            transition-delay:0.4s;
            left:10px;
            top:0;
          }
        }
        &:before{
          opacity:0;
          z-index:2;
          transition:0.2s ease-in-out;
        }
        &:before, &:after, .inner{
          content:'';
          position:absolute;
          width:112.5%;
          height:100%;
          left:12.5%;
          top:0;
          background-size:cover;
          transition:0.5s ease-in-out;
        }
        &:after{
          background:transparent;
          transition:0.5s ease-in-out;
        }
        &:before, .inner:after{
          filter:saturate(0);
        }
        .inner{
          width:40%;
          height:45%;
          left:auto;
          right:0%;
          z-index:999;
          top:auto;
          bottom:0;
          transform-origin:left;
          transform:scaleX(0);
          overflow:hidden;
          &:before, &:after{
            content:'';
            position:absolute;
            width:100%;
            height:100%;
            background:#222;
            left:0;
            top:0;
            z-index:2;
            transform:scaleX(1);
            transform-origin:right;
          }
          &:after{
            background-size:cover;
            z-index:1;
            transform-origin:50% 50%;
            transform:scale(1.5);
          }
        }
      }
      &.card1{
        .content{
          &:before, .inner:after{
            background-image:url('https://images.unsplash.com/photo-1558845530-c8963f0c26fa?ixlib=rb-1.2.1&auto=format&fit=crop&w=1650&q=80');
          }
        }
      }
      &.card2{
        .content{
          &:before, .inner:after{
            background-image:url('https://images.unsplash.com/photo-1558848369-839e86bc7f84?ixlib=rb-1.2.1&auto=format&fit=crop&w=1650&q=80');
          }
        }
      }
      &.card3{
        .content{
          &:before, .inner:after{
            background-image:url('https://images.unsplash.com/photo-1558775723-1f9ca54bb7cd?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2767&q=80');
          }
        }
      }
      &.card4{
        .content{
          &:before, .inner:after{
            background-image:url('https://images.unsplash.com/photo-1558848618-ce2c2e7bb671?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1650&q=80');
          }
        }
      }
      &:first-of-type{
        pointer-events:all;
        left:0;
        animation:scaleIn 1s ease-in-out 1 forwards;
        animation-delay:0s;
        transform:translateX(-100%);
        @keyframes scaleIn{
          from{
            transform:translateX(-100%);
          }
          to{
            transform:translateX(-75%);
          }
        }
        z-index:11;
        .content{
          &:before{
            opacity:0.25;
            animation:scaleDown 0.75s ease-in-out 1 forwards;
            animation-delay:0.25s;
            transform:translateX(6.75%);
            @keyframes scaleDown{
              to{
                transform:translateX(0);
              }
            }
          }
          &:after{
            background:#222;
          }
        }
      }
      &:nth-of-type(2){
        z-index:10;
        animation:scaleIn2 1s ease-in-out 1 forwards;
        will-change:transform;
        @keyframes scaleIn2{
          from{
            transform:translateX(-75%);
          }
          to{
            transform:translateX(0%);
          }
        }
        .content{
          p{
            transition-delay:1.85s;
            clip-path: polygon(0 0, 100% 0, 100% 100%, 0% 100%);
          }
          &:after{
            transition-delay:0.5s;
          }
          h3{
            transition:transform 0.2s ease-in-out;
            right:20px;
            transform:scaleX(1);
            transition-delay:2s;
            &:before{
              transform:translateY(0%);
              transition:0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
              transition-delay:2.25s;
            }
          }
          h1{
            right:100px;
          }
          .inner{
            animation:scaleIn4 0.5s ease-in-out 1 forwards;
            animation-delay:1.35s;
            will-change:transform;
            clip-path: polygon(0 0, 100% 0, 100% 100%, 0% 100%);
            @keyframes scaleIn4{
              to{
                transform:scaleX(1);
              }
            }
            &:after{
              animation:scaleUp 1s ease-in-out 1 forwards;
              animation-delay:1.9s;
              will-change:transform;
              @keyframes scaleUp{
                to{
                  transform:scale(1);
                }
              }
            }
            &:before{
              animation:scaleIn5 0.35s ease-in-out 1 forwards;
              animation-delay:1.75s;
              will-change:transform;
              @keyframes scaleIn5{
              to{
                transform:scaleX(0);
              }
            }
            }
          }
          &:before{
            animation:scaleIn3 1.5s ease-in-out 1 forwards;
            animation-delay:0.15s;
            opacity:1;
            will-change:transform;
            @keyframes scaleIn3{
              0%{
                transform:translateX(0%);
                clip-path: polygon(0% 0, 100% 0, 100% 100%, 0% 100%);
              }
              50%{
                transform:translateX(-12.5%);
                clip-path: polygon(0% 0, 100% 0, 100% 100%, 0% 100%);
              }
              100%{
                transform:translateX(-12.5%);
                clip-path: polygon(100% 0, 100% 0, 100% 100%, 100% 100%);
              }
            }
          }
        }
      }
      &:nth-of-type(3){
        z-index:3;
        .content{
          &:before, &:after{
            opacity:0;
            transition:0s;
            transition-delay:0s;
          }
          .inner{
            transform:scaleX(1);
            transition:0.5s ease-in-out;
            clip-path: polygon(100% 0, 100% 0, 100% 100%, 100% 100%);
            &:before{
              display:none;
            }
            &:after{
              transform:scale(1);
            }
          }
        }
      }
    }
  }
}
!

JS 

              
                

/*
 * based on this dribbble shot by Andrew Baygulov: https://dribbble.com/shots/6427548-Kaiser-Slideshow
 */

(function ($) {
    var isActive = false;

    $.fn.shuffleText = function(shuffleResult, options){
        var $this = $(this);

        // Add/Remove Chars You Want To Appear During Shuffle In This Array
        var aChars = new Array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","k","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");

        // Defaults Settings
        var defaults = $.extend({
            time     : 40,    // Time In ms (Milliseconds) Of Shuffle For Each Letter
            maxTime  : 1000,  // Max Time In ms (Milliseconds) Of Global Shuffle
            amount   : 3,     // Amount Of Shuffle For Each Letter
            complete : null   // Do Something When Shuffle Is Completed
        }, options);

        if(shuffleResult == undefined)
            shuffleResult = '';

        // Init Variables
        var aToShuffle     = $this.text().split(''),
            aShuffleResult = shuffleResult.split(''),
            iFlag = 0, n = 0, duration = 0, iLenght = 0,
            interval, aLetters;

        if(!isActive){
            isActive = true;
            // Launch Shuffle
            return $this.each(function(){
                replaceEntry();

                aLetters = $this.find('span');

                // Debugging
                if(defaults.amount < 0)
                    defaults.amount = 0;

                // Calculate Duration Of Global Shuffle
                if((iLength * (defaults.amount + 1) * defaults.time) > defaults.maxTime){
                    duration = defaults.maxTime / (iLength * (defaults.amount + 1));
                }else{
                    duration = defaults.time;
                }

                randomChars();
                interval = setInterval(randomChars,Math.floor(duration));

                // Create The Correct DOM Structure
                function replaceEntry(){
                    $this.empty();

                    if(aToShuffle.length > aShuffleResult.length)
                        iLength = aToShuffle.length;
                    else
                        iLength = aShuffleResult.length;

                    for(i = 0; i < iLength; i++){
                        if(aToShuffle[i] == undefined)
                            $this.append($('<span></span>'));
                        else
                            $this.append($('<span>'+aToShuffle[i]+'</span>'));
                    }
                }

                // The Shuffle Function
                function randomChars(){
                    var randomChars = aChars[Math.floor(Math.random() * aChars.length)];

                    if(iFlag >= iLength){
                        isActive = false;
                        $this.text(shuffleResult);

                        clearInterval(interval);
                        if(typeof defaults.complete == 'function')
                            defaults.complete.call($this);
                    }else{
                        if(n == defaults.amount){
                            if(iFlag >= aShuffleResult.length)
                                $(aLetters[iFlag]).text('');
                            else
                                $(aLetters[iFlag]).text(aShuffleResult[iFlag]);

                            iFlag++; n = 0;
                        }else{
                            $(aLetters[iFlag]).text(randomChars);
                            n++;
                        }
                    }
                }
            });
        }
    };
}(jQuery));


$("#trigger").click(function(){
      $('.card').removeClass("active");
      $('#wrapper').prepend($('#wrapper .card:last'));
      $(this).addClass("flash");
      $('#wrapper').addClass("flash");
      $('.card:nth-of-type(2)').addClass("active");
      $text = $('.active .word').text();
      setTimeout(function(){
        $(".active .word").shuffleText($text, {
          frames   : 2000,  
          maxSpeed : 1,
          amount   : 35,
          complete : null  
          });
        
          }, 1200);
      setTimeout(function(){
        $("#trigger").removeClass("flash");
        $("#wrapper").removeClass("flash");
        
                }, 2000);
});
!
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