Griglia a pulsanti

<!-- 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>Testo del box 1..</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>Testo del box 2..</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>Testo del box 3..</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;
}

<script type="text/javascript">
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";
}
</script>