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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

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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

            
              <p>Resize this frame to see the responsive effect.</p>
<p><i>Restricted width at larger vieweports for demo purposes:</i></p>

<article class="float-hidden-module md-50">
  <h2>The Loneliest Young Star</h2>
  <div class="float-hidden-module__image  float-hidden-module__image--left">
    <img src="https://res.cloudinary.com/andykirk/image/upload/v1488115638/nasa/pia20700.jpg" alt="Artist’s concept shows an unusual celestial object called CX330 " />
  </div>
  <p><b>An unusual celestial object called CX330 was first detected as a source of X-ray light in 2009. It has been launching “jets” of material into the gas and dust around it.</b></p>
  <p>
    <cite>—
      <a href="https://www.nasa.gov/multimedia/imagegallery/iotd.html">NASA</a>
    </cite>
  </p>
  <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
</article>

<article class="float-hidden-module">
  <h2>The Loneliest Young Star</h2>
  <div class="float-hidden-module__image  float-hidden-module__image--left">
    <img src="https://res.cloudinary.com/andykirk/image/upload/v1488115638/nasa/pia20700.jpg" alt="Artist’s concept shows an unusual celestial object called CX330 " />
  </div>
  <p><b>An unusual celestial object called CX330 was first detected as a source of X-ray light in 2009. It has been launching “jets” of material into the gas and dust around it.</b></p>
  <p>
    <cite>—
      <a href="https://www.nasa.gov/multimedia/imagegallery/iotd.html">NASA</a>
    </cite>
  </p>
  <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
</article>

<p><i>And again with longer content and right-floating for demo purposes:</i></p>

<article class="float-hidden-module md-50">
  <h2>The Loneliest Young Star</h2>
  <div class="float-hidden-module__image  float-hidden-module__image--right">
    <img src="https://res.cloudinary.com/andykirk/image/upload/v1488115638/nasa/pia20700.jpg" alt="Artist’s concept shows an unusual celestial object called CX330 " />
  </div>
  <p><b>An unusual celestial object called CX330 was first detected as a source of X-ray light in 2009. It has been launching “jets” of material into the gas and dust around it.</b></p>
  <p>
    <cite>—
      <a href="https://www.nasa.gov/multimedia/imagegallery/iotd.html">NASA</a>
    </cite>
  </p>
  <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui.</p>
  <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
</article>

<article class="float-hidden-module">
  <h2>The Loneliest Young Star</h2>
  <div class="float-hidden-module__image  float-hidden-module__image--right">
    <img src="https://res.cloudinary.com/andykirk/image/upload/v1488115638/nasa/pia20700.jpg" alt="Artist’s concept shows an unusual celestial object called CX330 " />
  </div>
  <p><b>An unusual celestial object called CX330 was first detected as a source of X-ray light in 2009. It has been launching “jets” of material into the gas and dust around it.</b></p>
  <p>
    <cite>—
      <a href="https://www.nasa.gov/multimedia/imagegallery/iotd.html">NASA</a>
    </cite>
  </p>
  <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui.</p>
  <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
</article>
!

CSS

            
              /* Basic common settings: */
$primary-color: rgb(0,20,30);
$secondary-color: rgb(171, 101, 20);
$module-breakpoint: 30em;

*, ::before, ::after {
  box-sizing: border-box;
}

body {
  font-family: 'Lato', sans-serif;
  font-size: 0.9375rem;
  line-height: 1.4;
  padding: 1rem;
  margin: 0;
}

h2 {
  margin-top: 0;
}

img {
  /* Remove whitespace under images: */
  vertical-align: middle;
}

a {
  color: $secondary-color;
  &:hover {
    color: lighten($secondary-color, 50);
  }
}


/* Double last margin prevention hack. Not intended for production. */
.float-hidden-module p:last-of-type {
  margin-bottom: 0;
}

/*
  Demonstrate container query-esque responsiveness:
*/
@media only screen and (min-width:40em) {
  .md-50 {
    max-width: 50%;
  }
}

/* The pattern: */

.float-hidden-module {
  /* Cosmetics (not part of the pattern): */
  margin-bottom: 1em;
  background: $primary-color;
  color: #fff;
  
  padding: 1em;
}

.float-hidden-module:after {
  content: "";
  display: table;
  clear: both;
}

.float-hidden-module__image {
  width: calc((25em - 100%) * -1000);
  max-width: 50%;
  
  margin-bottom: 1rem;
  
  /* Hide the border when image is collaped: */
  overflow: hidden;
}

.float-hidden-module__image img {
  /* This is the easiest way to create space betweem the image and the text: */
  width: calc(100% - 1em);
  
  /* Cosmetic only: */
  border: 1px solid;
}

.float-hidden-module__image--left {
  float: left;
}

.float-hidden-module__image--right {
  float: right;
  margin-left: 1rem;
}
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