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HTML

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-.

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Add External Stylesheets/Pens

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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 

              
                <section id="timeline">


  <div class="tl-item">
    

        <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/d/header_wieland_ny-1cdf09e4.jpg
)"></div>
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2009</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Vestibulum laoreet lorem</h1>
      <p>Suspendisse potenti. Sed sollicitudin eros lorem, eget accumsan risus dictum id. Maecenas dignissim ipsum vel mi rutrum egestas. Donec mauris nibh, facilisis ut hendrerit vel, fringilla sed felis. Morbi sed nisl et arcu.</p>
    </div>

  </div>

  <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/6/kachel_careers_spot-eeeb207b.jpg)">
      
    </div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2010</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Phasellus mauris elit</h1>
      <p>Mauris cursus magna at libero lobortis tempor. Suspendisse potenti. Aliquam interdum vulputate neque sit amet varius. Maecenas ac pulvinar nisi. Fusce vitae nunc ultrices, tristique dolor at, porttitor dolor. Etiam id cursus arcu, in dapibus nibh. Pellentesque non porta leo. Nulla eros odio, egestas quis efficitur vel, pretium sed.</p>
    </div>

  </div>

  <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/2/home_slider_empowering_success_thenewbrandpage-c8c3fca2.jpg
)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2011</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Mauris vitae nunc elem</h1>
      <p>Suspendisse ac mi at dolor sodales faucibus. Nunc sagittis ornare purus non euismod. Donec vestibulum efficitur tortor, eget efficitur enim facilisis consequat. Vivamus laoreet laoreet elit. Ut ut varius metus, bibendum imperdiet ex. Curabitur diam quam, blandit at risus nec, pulvinar porttitor lorem. Pellentesque dolor elit.</p>
    </div>

  </div>
    <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/9/responsibility_3-54e5a756.jpg
)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2012</p>
    </div>

    <div class="tl-content">
      <h1>Lorem ipsum dolor sit</h1>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit.</p>
    </div>

  </div>

  <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/3/strips_sheets_coilsdrums-b0b72ee3.png)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2013</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Vestibulum laoreet lorem</h1>
      <p>Suspendisse potenti. Sed sollicitudin eros lorem, eget accumsan risus dictum id. Maecenas dignissim ipsum vel mi rutrum egestas. Donec mauris nibh, facilisis ut hendrerit vel, fringilla sed felis. Morbi sed nisl et arcu.</p>
    </div>

  </div>

  <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/b/header_wieland_eMobility_1-f1ea109f.jpg)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2014</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Phasellus mauris elit</h1>
      <p>Mauris cursus magna at libero lobortis tempor. Suspendisse potenti. Aliquam interdum vulputate neque sit amet varius. Maecenas ac pulvinar nisi. Fusce vitae nunc ultrices, tristique dolor at, porttitor dolor. Etiam id cursus arcu, in dapibus nibh. Pellentesque non porta leo. Nulla eros odio, egestas quis efficitur vel, pretium sed.</p>
    </div>

  </div>

  <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/6/kachel_careers_spot-eeeb207b.jpg)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2015</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Mauris vitae nunc elem</h1>
      <p>Suspendisse ac mi at dolor sodales faucibus. Nunc sagittis ornare purus non euismod. Donec vestibulum efficitur tortor, eget efficitur enim facilisis consequat. Vivamus laoreet laoreet elit. Ut ut varius metus, bibendum imperdiet ex. Curabitur diam quam, blandit at risus nec, pulvinar porttitor lorem. Pellentesque dolor elit.</p>
    </div>

  </div>
  
    <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/3/strips_sheets_coilsdrums-b0b72ee3.png)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2016</p>
    </div>

    <div class="tl-content">
      <h1>Lorem ipsum dolor sit</h1>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit.</p>
    </div>

  </div>

  <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/2/home_slider_empowering_success_thenewbrandpage-c8c3fca2.jpg)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2017</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Vestibulum laoreet lorem</h1>
      <p>Suspendisse potenti. Sed sollicitudin eros lorem, eget accumsan risus dictum id. Maecenas dignissim ipsum vel mi rutrum egestas. Donec mauris nibh, facilisis ut hendrerit vel, fringilla sed felis. Morbi sed nisl et arcu.</p>
    </div>

  </div>

  <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/b/header_wieland_eMobility_1-f1ea109f.jpg)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2018</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Phasellus mauris elit</h1>
      <p>Mauris cursus magna at libero lobortis tempor. Suspendisse potenti. Aliquam interdum vulputate neque sit amet varius. Maecenas ac pulvinar nisi. Fusce vitae nunc ultrices, tristique dolor at, porttitor dolor. Etiam id cursus arcu, in dapibus nibh. Pellentesque non porta leo. Nulla eros odio, egestas quis efficitur vel, pretium sed.</p>
    </div>

  </div>

  <div class="tl-item">
    
    <div class="tl-bg" style="background-image: url(https://www.wieland.com/assets/images/d/header_wieland_ny-1cdf09e4.jpg)"></div>
    
    <div class="tl-year">
      <p class="f2 heading--sanSerif">2019</p>
    </div>

    <div class="tl-content">
      <h1 class="f3 text--accent ttu">Mauris vitae nunc elem</h1>
      <p>Suspendisse ac mi at dolor sodales faucibus. Nunc sagittis ornare purus non euismod. Donec vestibulum efficitur tortor, eget efficitur enim facilisis consequat. Vivamus laoreet laoreet elit. Ut ut varius metus, bibendum imperdiet ex. Curabitur diam quam, blandit at risus nec, pulvinar porttitor lorem. Pellentesque dolor elit.</p>
    </div>

  </div>
</section>
!

CSS 

              
                body {
  font-family: "Source Sans Pro", Helvetica Neue, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

#timeline {
  display: flex;
  background-color: #031625;

  &:hover {
    .tl-item {
      width: 23.3333%;
    }
  }
}

.tl-item {
  transform: translate3d(0, 0, 0);
  position: relative;
  width: 25%;
  height: 100vh;
  min-height: 600px;
  color: #fff;
  overflow: hidden;
  transition: width 0.5s ease;

  &:before,
  &:after {
    transform: translate3d(0, 0, 0);
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
  }

  &:after {
    background: transparentize(#e0251b, 0.15);
    opacity: 1;
    transition: opacity 0.5s ease;
  }

  &:before {
    background: linear-gradient(
      to bottom,
      rgba(0, 0, 0, 0) 0%,
      rgba(0, 0, 0, 1) 75%
    );
    z-index: 1;
    opacity: 0;
    transform: translate3d(0, 0, 0) translateY(50%);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }

  &:hover {
    width: 30% !important;

    &:after {
      opacity: 0;
    }

    &:before {
      opacity: 1;
      transform: translate3d(0, 0, 0) translateY(0);
      transition: opacity 1s ease, transform 1s ease 0.25s;
    }

    .tl-content {
      opacity: 1;
      transform: translateY(0);
      transition: all 0.75s ease 0.5s;
    }

    .tl-bg {
      filter: grayscale(0);
    }
  }
}

.tl-content {
  transform: translate3d(0, 0, 0) translateY(25px);
  position: relative;
  z-index: 1;
  text-align: center;
  margin: 0 1.618em;
  top: 55%;
  opacity: 0;

  h1 {
    font-family: "Pathway Gothic One", Helvetica Neue, Helvetica, Arial,
      sans-serif;
    text-transform: uppercase;
    color: #1779cf;
    font-size: 1.44rem;
    font-weight: normal;
  }
}

.tl-year {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
  z-index: 1;
  border-top: 1px solid #fff;
  border-bottom: 1px solid #fff;

  p {
    font-family: "Pathway Gothic One", Helvetica Neue, Helvetica, Arial,
      sans-serif;
    font-size: 1.728rem;
    line-height: 0;
  }
}

.tl-bg {
  transform: translate3d(0, 0, 0);
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-size: cover;
  background-position: center center;
  transition: filter 0.5s ease;
  filter: grayscale(100%);
}
!

JS
!
999px

Console