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              <div class="container">
<button>Toggle Fix</button>
  <div class="grid">
    <article class="post">
      <div>
        <pre><code>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Excepturi ex tempora velit repellat vitae! Quidem itaque, error, officiis magni at vel architecto sit blanditiis fugiat dolorem a quia dolorum doloremque.</code></pre>
      </div>
      </article>
    <aside>
      I AM A SIDEBAR
    </aside>
  </div>
</div>
            
          
!
            
              * {
  box-sizing: border-box;
}

img {
  max-width: 100%;
  height: auto;
}

aside {
  background: pink;
  text-align: center;
}

.container {
  padding: 0 2em;
  width: 100%;
  max-width: 1234px;
  margin: 0 auto;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  grid-gap: 2em;
}

// RUT-ROH
// Let's say inside a Grid we have an overflow-x element, like a standard <pre><code> block...
pre {
  overflow-x: auto;
  background: lightgrey;
  padding: 1em;
  max-width: 100%;
}

// That element will break the grid due to the nature of its inherent `white-space: pre|nowrap`
// Your first instinct is to wrap that element in a `<div>` and overflow hidden it
// (like a responsive table or something)

.post div {
  overflow: hidden;
  min-width: 0;
  max-width: 100%;
}
// THESE DO NOTHING. WOMP WOMP.

// To Fix, you have to go all the way up and specify DISABLE the default `min-width: auto` on the Grid Item 

// .grid > * {
//   min-width: 0;
// }
// THIS IS THE FIX

.fix .grid > * {
  min-width: 0;
}

            
          
!
            
              document.querySelector('button').addEventListener('click', function(event) {
  event.preventDefault();
  document.body.classList.toggle('fix');
});
            
          
!
999px
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