<div class="container">
  <div class="content">Content…<br/>…<br/>…</div>
  <div class="side-1">Side 1</div>
  <div class="side-2">Side 2</div>  
</div>

<br><br><br>

<p>
  Autoprefixer is not sufficient for Grid. IE10+11 implementation works 
  differently. I recommend reading the following articles:
</p>

<ul>
  <li><a href="https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout/CSS_Grid_and_Progressive_Enhancement">CSS Grid Layout and Progressive Enhancement</a></li>
  <li><a href="https://rachelandrew.co.uk/archives/2016/11/26/should-i-try-to-use-the-ie-implementation-of-css-grid-layout/">Differences between those two CSS Grids</a></li>
</ul>

.container {
  display: -ms-grid; /* IE10+11 */
  display: grid;  
}

.container > * {
  margin-bottom: .5em;
}

.container > :last-child {
  margin: 0;
}

@media screen and (min-width: 600px) {
  .container {
    grid-template-columns: 1fr 3fr 1fr;
  }
  
  .container > * {
    margin-bottom: 0;
  }
  
  .side-1 {
    order: -1;    
  }
  
  /* IE10+11:  */  
  
  .container {
    -ms-grid-columns: 1fr 3fr 1fr;
  }  
   
  .side-1 {
    -ms-grid-column: 1;
    -ms-grid-column-span: 1;    
    margin-right: .5em;
  }

  .content {
    -ms-grid-column: 2;
    -ms-grid-column-span: 1;    
    margin-right: .5em;    
  }  

  .side-2 {
    -ms-grid-column: 3;
    -ms-grid-column-span: 1;    
  }    
    
}  

  
  
/* etc: */

.container > * {
  padding: 1em;
  background: #b3e888;
}

body {
  padding: 1em;
}

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