How TO - Expanding Grid

  <!-- The grid: three columns -->

  <div class="row">
 
  <div class="column" onclick="openTab('b1');" style="background:green;">Box
  1</div>
  <div class="column" onclick="openTab('b2');" style="background:blue;">Box
  2</div>
  <div class="column" onclick="openTab('b3');" style="background:red;">Box
  3</div>
</div>

<!-- The expanding grid (hidden by default) -->

  <div id="b1" class="containerTab" style="display:none;background:green">
 
  <!-- If you want the ability to close the container, add a close button -->
 
  <span onclick="this.parentElement.style.display='none'" class="closebtn">x</span>
 
  <h2>Box 1</h2>
  <p>Lorem ipsum..</p>
</div>

<div id="b2" class="containerTab" style="display:none;background:blue">
 
  <span onclick="this.parentElement.style.display='none'" class="closebtn">x</span>
 
  <h2>Box 2</h2>
  <p>Lorem ipsum..</p>
</div>

<div id="b3" class="containerTab" style="display:none;background:red">
 
  <span onclick="this.parentElement.style.display='none'" class="closebtn">x</span>
 
  <h2>Box 3</h2>
  <p>Lorem ipsum..</p>
</div>

  /* The grid: Three equal columns that floats next to each other */
.column
  {
 
  float: left;
  width: 33.33%;
 
  padding: 50px;
  text-align: center;
 
  font-size: 25px;
  cursor: pointer;
  color: white;
}

.containerTab
  {
  padding: 20px;
  color: white;

  }

/* Clear floats after the
  columns */
.row:after {
  content: "";
  display: table;

    clear: both;
}

/* Closable button inside the image */
.closebtn {

   
  float: right;
  color: white;
 
  font-size: 35px;
  cursor: pointer;
}

  // Hide all elements with class="containerTab",
  except for the one that matches the clickable grid column
function openTab(tabName) {

   
  var i, x;
  x = document.getElementsByClassName("containerTab");

   
  for (i = 0; i < x.length; i++) {
   
  x[i].style.display = "none";
  }
  document.getElementById(tabName).style.display = "block";
}