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HTML

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About the <head>

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Insecure Resource

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CSS

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CSS Base

About CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <header class="header">
  <h1>The Envato Tuts+ Report</h1>
  <h2><a href="https://webdesign.tutsplus.com/tutorials/how-to-build-a-news-website-layout-with-flexbox--cms-26611">Read tutorial</a></h2>
</header>
  
 <main class="main columns">
  <section class="column main-column">
    <a class="article first-article" href="#">
      <figure class="article-image is-4by3">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/210284/image-01-lo.jpg" alt="">
      </figure>
      <div class="article-body">
        <h2 class="article-title">
          Hello World
        </h2>
        <p class="article-content">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ornare magna eros, eu pellentesque tortor vestibulum ut. Maecenas non massa sem. Etiam finibus odio quis feugiat facilisis.
          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ornare magna eros.
        </p>
        <footer class="article-info">
          <span>By Joe Smith</span>
          <span>42 comments</span>
        </footer>
      </div>
    </a>

    <div class="columns">
      <div class="column nested-column">
        <a class="article" href="#">
          <figure class="article-image is-16by9">
            <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/210284/image-02-lo.jpg" alt="">
          </figure>
          <div class="article-body">
            <h2 class="article-title">
              Hello World
            </h2>
            <p class="article-content">
              Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ornare magna eros, eu pellentesque tortor vestibulum ut. Maecenas non massa sem. Etiam finibus odio quis feugiat facilisis.
              Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ornare magna eros, eu pellentesque tortor vestibulum ut. Maecenas non massa sem. Etiam finibus odio quis feugiat facilisis.
            </p>
            <footer class="article-info">
              <span>By Joe Smith</span>
              <span>42 comments</span>
            </footer>
          </div>
        </a>
      </div>

      <div class="column">
        <a class="article" href="#">
          <figure class="article-image is-16by9">
            <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/210284/image-03-lo.jpg" alt="">
          </figure>
          <div class="article-body">
            <h2 class="article-title">
              Hello World
            </h2>
            <p class="article-content">
              Lorem ipsum dolor sit amet, consectetur adipiscing elit.
            </p>
            <footer class="article-info">
              <span>By Joe Smith</span>
              <span>42 comments</span>
            </footer>
          </div>
        </a>
        <a class="article" href="#">
          <div class="article-body">
            <h2 class="article-title">
              Hello World
            </h2>
            <p class="article-content">
              Lorem ipsum dolor sit amet.
            </p>
            <footer class="article-info">
              <span>By Joe Smith</span>
              <span>42 comments</span>
            </footer>
          </div>
        </a>
        <a class="article" href="#">
          <div class="article-body">
            <h2 class="article-title">
              Hello World
            </h2>
            <p class="article-content">
              Lorem ipsum dolor sit amet feugiat facilisis.
            </p>
            <footer class="article-info">
              <span>By Joe Smith</span>
              <span>42 comments</span>
            </footer>
          </div>
        </a>
      </div>
    </div>
  </section>

  <section class="column">
    <a class="article" href="#">
      <figure class="article-image is-3by2">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/210284/image-04-lo.jpg" alt="">
      </figure>
      <div class="article-body">
        <h2 class="article-title">
          Hello World
        </h2>
        <p class="article-content">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit.
          Lorem ipsum dolor sit amet, consectetur adipiscing elit.
          Lorem ipsum dolor sit amet, consectetur adipiscing elit.
        </p>
        <footer class="article-info">
          <span>By Joe Smith</span>
          <span>42 comments</span>
        </footer>
      </div>
    </a>
    <a class="article" href="#">
      <div class="article-body">
        <h2 class="article-title">
          Hello World
        </h2>
        <p class="article-content">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit.
        </p>
        <footer class="article-info">
          <span>By Joe Smith</span>
          <span>42 comments</span>
        </footer>
      </div>
    </a>
    <a class="article" href="#">
      <div class="article-body">
        <h2 class="article-title">
          Hello World
        </h2>
        <p class="article-content">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit.
        </p>
        <footer class="article-info">
          <span>By Joe Smith</span>
          <span>42 comments</span>
        </footer>
      </div>
    </a>
    <a class="article" href="#">
      <div class="article-body">
        <h2 class="article-title">
          Hello World
        </h2>
        <p class="article-content">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit.
        </p>
        <footer class="article-info">
          <span>By Joe Smith</span>
          <span>42 comments</span>
        </footer>
      </div>
    </a>
  </section>
</main>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700);
@import url(https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css);

html {
  background: mediumseagreen;
  font-size: 14px;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  min-width: 300px;
  overflow-x: hidden;
  overflow-y: scroll;
  text-rendering: optimizeLegibility;
}

body {
  color: #666;
  font-family: "Source Sans Pro", "Helvetica", "Arial", sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.4;
}

a {
  text-decoration: none;
  transition: all 0.3s cubic-bezier(.25, .8, .25, 1);
}

div, h2, p, figure {
  margin: 0;
  padding: 0;
}

.header {
  color: white;
  padding: 40px 0 20px;
  text-align: center;
}

.header h1 {
  font-size: 40px;
  font-weight: bold;
}

.header h2 a {
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  color: white;
  font-size: 20px;
  opacity: 0.5;
}

.header h2 a:hover {
  border-bottom-color: white;
  opacity: 1;
}

.main {
  margin: 0 auto;
  max-width: 1040px;
  padding: 10px;
}

.column {
  flex: 1;
  flex-direction: column;
}

.article {
  background: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  color: #666;
  display: flex;
  flex: 1;
  flex-direction: column;
  flex-basis: auto;
  margin: 10px;
}

.article:hover,
.article:focus {
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
  color: #444;
}

.article-image {
  background: #eee;
  display: block;
  padding-top: 75%;
  position: relative;
  width: 100%;
}

.article-image img {
  display: block;
  height: 100%;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}

.article-image.is-3by2 {
  padding-top: 66.6666%;
}

.article-image.is-16by9 {
  padding-top: 56.25%;
}

.article-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 20px;
}

.article-title {
  color: #333;
  flex-shrink: 0;
  font-size: 1.4em;
  font-weight: 700;
  line-height: 1.2;
}

.article-content {
  flex: 1;
  margin-top: 5px;
}

.article-info {
  display: flex;
  font-size: 0.85em;
  justify-content: space-between;
  margin-top: 10px;
}

@media screen and (min-width: 800px) {
  .columns,
  .column {
    display: flex;
  }
}

@media screen and (min-width: 1000px) {
  .first-article {
    flex-direction: row;
  }

  .first-article .article-body {
    flex: 1;
  }

  .first-article .article-image {
    height: 300px;
    order: 2;
    padding-top: 0;
    width: 400px;
  }

  .main-column {
    flex: 3;
  }

  .nested-column {
    flex: 2;
  }
}
!

JS
!
999px

Console