JSFiddle - React, Tailwind, and code Playground

HTML

<div class="grid">
			<div class="block" id="block1">1
			</div>
			<div class="block" id="block2">2</div>
			<div class="block" id="block3">3</div>
			<div class="block" id="block4">4</div>
      <div class="block" id="block5">5</div>
			<div class="block" id="block6">6</div>
	</div>

CSS

*{
	margin: 0;
	padding: 0;
}

html, body{
	width: 100%;
	height: 100%;
}

.grid{
	width: 100%;
	height: 100%;
	/*background-color: #114411;*/
}

.block{
	width: 33.3%;
  height: 50%;
	float: left;
	color: #FFFFFF;
	position: relative;
  transition: all 1s;
}

.block.expanded {
  width: 100%;
  height: 100%;
  transition: all 1s;
}

.retractor{
	width: 50px;
	height: 50px;
	padding: 10px 0;
	text-align: center;
	background-color: #FF0000;
	color: #FFFFFF;
	font-family: 'Open Sans', sans-serif;
	
	position: absolute;
	bottom: 30px;
	right: 30px;
}

#block1{
	background-color: #222222;
}			

#block2{
	background-color: #999999;
}			

#block3{
	background-color: #5555555;
}			

#block4{
	background-color: #999999;
}	

#block5{
	background-color: #333333;
}		

#block6{
	background-color: #BBBBBB;  
}

JavaScript

$('#block1').click(function(){
			$(this).toggleClass("expanded");
  });