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

/* 
@use autoprefixer {
  grid: true;
  browsers: "> 1%"
};

(@use is obsolete in CodePen) */

.container {
  display: grid;
  grid-template-columns: 1fr 3fr 1fr;
  grid-template-areas: "a b c";
  column-gap: 0.5em;      
}

.side-1 {
  grid-area: a;
}

.content {
  grid-area: b;  
}

.side-2 {
  grid-area: c;  
}


/* ETC (Formatting only): */

body {
  margin: 1.5em;
  font-size: 130%;
  font-family: sans-serif;
  background: #F2F0EC;
  color: #2E2C08;
}

.container {
  border: 10px solid #2E2C08;
  background: white;  
  padding: 1em;
}

.container > * {
  padding: 0.5em;
  text-align: center;
  background: #e5e3de;
  font-weight: bold;
}
View Compiled

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.