<div class="container">
  <p class="item">.item</p>
</div>
.container {
  display: grid;
  gap: 10px;
  grid-template-columns: [first-col] 1fr [second-col] 1fr [third-col] 1fr [end];
  grid-template-rows: [first-row] 2rem [second-row] 2rem [third-row] 2rem [end];
}

.item {
  grid-column: second-col / third-col;
  grid-row: second-row / end;
  /*
  grid-column-start: second-col;
  grid-column-end: third-col;
  grid-row-start: second-row;
  grid-row-end: end;
  */
}


/* etc: */

body {
  margin: 1.5em;
  font-size: 130%;
}

.item {
  background: #b3e888;
  padding: 1em;
  margin-top: 0;
  margin-bottom: 0;
  font-family: monospace;
  text-align: center;
  border: 1px solid darkgreen;
  /* "border-collapse" hack */
  margin-left: -1px;
  margin-top: -1px;
}

.container {
  border: 5px solid black;
  padding: 1em;
  margin-bottom: 2em;  
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.