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HTML

              
                <!-- This wrapper here is important -->
<section class="article-wrap">
  <article class="article-content">
    <h1>This is a header</h1>
    <p>
      The content area is fluid width, while the sidebar staying fixed width. No hacks, no bullshit just normal CSS.
    </p>
    <p>Labore laborum beatae cupiditate necessitatibus laudantium velit quidem commodi quisquam reprehenderit corporis amet dolorem et fuga maxime recusandae. Harum iusto deleniti quo nam magni minus sunt amet iste vel explicabo.</p>
    <p>Deserunt aspernatur iure ad! Earum illum numquam in saepe nostrum reiciendis corrupti tenetur quis repudiandae unde ullam enim atque distinctio maxime ipsum ea velit animi non molestias veniam sed sunt.</p>
    <p>Doloribus maxime repellendus quae omnis consequuntur tenetur quod itaque optio molestiae magnam nemo tempore earum dignissimos vel cupiditate fugit odit asperiores at aperiam labore qui error molestias modi veritatis harum.</p>
    <p>Dolore magni voluptate ullam illum fugit tempora suscipit sed saepe sequi adipisci accusantium in dolorum facere! Sequi iure nemo aliquid praesentium rerum maiores culpa blanditiis est adipisci velit sunt iusto.</p>
  </article>
</section>
<aside class="sidebar">
  <h2>Sidebar</h2>
  <ul>
    <li>Lorem.</li>
    <li>Natus.</li>
    <li>Voluptatibus.</li>
    <li>Esse!</li>
    <li>Laudantium.</li>
  </ul>
</aside>
              
            
!

CSS

              
                @import "compass/css3";

// Variabless
$sidebar-width: 200px;

.article-wrap {
  margin-right: $sidebar-width;
}
.article-content,
.sidebar {
  background: Aquamarine;
  box-sizing: border-box;
  float: left;
  padding: 20px;
}
.article-content {
  width: 100%;
}
.sidebar {
  border-left: 20px solid white;
  width: $sidebar-width;
}



// Just irrelevant styling
body {
  padding: 20px;
}
h1,
h2,
p {
  margin: 0 0 10px 0;
}
h2 {
  font-size: 20px;
}
ul {
  padding-left: 20px;
}
              
            
!

JS

              
                
              
            
!
999px

Console