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About HTML Preprocessors

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

About CSS Preprocessors

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.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="container">
    <div class="row">
        <div class="col-12">
            <h1>TIMELINE</h1>
        </div>
    </div>
    <div class="row animation-row">
        <div class="col-12">
            <div class="svg-dashed-line">
                <svg id="Layer_1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 289.01 352.69">
                    <defs>
                        <style>.cls-1{stroke-dasharray:0 0 11.76 11.76;}.cls-1,.cls-2,.cls-3{fill:none;stroke:#DEDEDE;stroke-miterlimit:10;}.cls-3{stroke-dasharray:0 0 11.99 11.99;}</style>
                    </defs>
                    <path class="cls-2" d="M144.51,0s0,2.41-1.72,5.7"/>
                    <path class="cls-1" d="M134.88,14.25c-7.48,5.16-20.77,9.75-44.37,9.75h-42.12"/>
                    <path class="cls-2" d="M42.51,24h-6s-2.41-.13-5.99.25"/>
                    <path class="cls-3" d="M18.89,27.01C9.95,30.51.89,38,.51,54c-.75,31.89,36,29.43,36,29.43h216s36,.9,36,30.57-36,29.67-36,29.67H36.51s-36-.33-36,29.67,36,30,36,30h216s36-1.15,36,29.43-36,30.57-36,30.57H36.51s-36,0-36,29.67,36,29.67,36,29.67h54s39.02.41,50.72,18.62"/>
                    <path class="cls-2" d="M143.7,346.75c.52,1.83.8,3.81.8,5.93"/>
                </svg>
            </div>
        </div>
        <div class="col-12 years">
            <div class="row nekaj">
                <div class="col-12 col-md-5 offset-md-4 text-center box-top">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 text-end box-left">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 offset-md-8 box-right">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 text-end box-left">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 offset-md-8 box-right">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 text-end box-left">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
    <div class="row animation-row">
        <div class="col-12">
            <div class="svg-dashed-line">
                <svg id="Layer_1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 289.01 352.69">
                    <defs>
                        <style>.cls-1{stroke-dasharray:0 0 11.76 11.76;}.cls-1,.cls-2,.cls-3{fill:none;stroke:#DEDEDE;stroke-miterlimit:10;}.cls-3{stroke-dasharray:0 0 11.99 11.99;}</style>
                    </defs>
                    <path class="cls-2" d="M144.51,0s0,2.41-1.72,5.7"/>
                    <path class="cls-1" d="M134.88,14.25c-7.48,5.16-20.77,9.75-44.37,9.75h-42.12"/>
                    <path class="cls-2" d="M42.51,24h-6s-2.41-.13-5.99.25"/>
                    <path class="cls-3" d="M18.89,27.01C9.95,30.51.89,38,.51,54c-.75,31.89,36,29.43,36,29.43h216s36,.9,36,30.57-36,29.67-36,29.67H36.51s-36-.33-36,29.67,36,30,36,30h216s36-1.15,36,29.43-36,30.57-36,30.57H36.51s-36,0-36,29.67,36,29.67,36,29.67h54s39.02.41,50.72,18.62"/>
                    <path class="cls-2" d="M143.7,346.75c.52,1.83.8,3.81.8,5.93"/>
                </svg>
            </div>
        </div>
        <div class="col-12 years">
            <div class="row nekaj">
                <div class="col-12 col-md-5 offset-md-4 text-center box-top">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 text-end box-left">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 offset-md-8 box-right">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 text-end box-left">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 offset-md-8 box-right">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="col-6 col-md-4 text-end box-left">
                    <div class="year-wrapper">
                        <div class="year">
                            <div class="year-title">
                                <h2>1990</h2>
                            </div>
                            <div class="year-dsc">
                                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia nemo non repellendus sequi?</p>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>


</div>
!

CSS 

              
                html {

}

body {
  margin: 0;
  font-size: 16px;
  padding: 0;
  font-family: 'Open Sans',sans-serif;
  overflow-x: hidden;
  color: #21211f;
  font-weight: 300;
}

h1 {
  text-align: center;
}

.animation-row {
  position: relative;
}

.svg-dashed-line {
  margin-left: auto;
  margin-right: auto;
  margin-top: 95px;
  margin-bottom: 0;
  width: 37%;
}

.years {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  .nekaj {
    .box-left, .box-right {
      position: relative;
      &:first-child {
        padding-left: 0;
        padding-bottom: 50px;
      }
      &:nth-child(odd) {
        padding-left: 50px;
        &:before {
          content: '';
          position: absolute;
          z-index: 1;
          top: 0;
          left: 0;
          height: 100%;
          width: 36px;
          background-image: url('data:image/png;base64,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');
          background-repeat: no-repeat;
          background-size: contain;
          background-position: center;
        }
      }
      &:nth-child(even) {
        padding-right: 50px;
        &:after {
          content: '';
          position: absolute;
          z-index: 1;
          top: 0;
          right: 0;
          height: 100%;
          width: 36px;
          background-image: url('data:image/png;base64,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');
          background-repeat: no-repeat;
          background-size: contain;
          background-position: center;
        }
      }
    }
  }
  .year-wrapper {
    position: relative;
    margin-bottom: 24px;
    .year-title {
      h2 {
        font-family: 'Open Sans Condensed',sans-serif;
        color: #e4032e;
        font-weight: 700;
      }
    }
    .year-dsc {
      p {
        font-size: 14px;
      }
    }
  }
}
!

JS 

              
                function docReady(fn) {
    if(document.readyState === "complete" || document.readyState === "interactive") {
        setTimeout(fn, 1);
    } else {
        document.addEventListener("DOMContentLoaded", fn);
    }}

docReady(function() {
    window.onload = function() {
        gsap.to('.cls-1', {
            duration: 2,
            strokeDasharray: "11.76 11.76",
            ease: "linear"
        });

        gsap.to('.cls-2', {
            duration: 2,
            strokeDasharray: "11.76 11.76",
            ease: "linear"
        });

        gsap.to('.cls-3', {
            duration: 2,
            strokeDasharray: "11.99 11.99",
            ease: "linear"
        });

        let revealLeftBox = document.querySelectorAll(".box-left");
        let revealRightBox = document.querySelectorAll(".box-right");
        let revealTopBox = document.querySelectorAll(".box-top");

        gsap.from(revealLeftBox, {
            duration: 1,
            opacity: 0,
            x: -30,
            ease: "linear",
            stagger: .75
        });
        gsap.from(revealRightBox, {
            duration: 1,
            opacity: 0,
            x: 50,
            ease: "linear",
            stagger: .75
        });
        gsap.from(revealTopBox, {
            duration: 1,
            opacity: 0,
            y: -30,
            ease: "linear",
            stagger: .75
        });
    };
});
!
999px

Console