JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div class="wrapper">
	<div class="span6">
		<div class="box">Box1<br>Box1<br>Box1<br>Box1<br>Box1<br></div>
		<div class="box2">Box2</div>
	</div>
	
	<div class="span6">
		<div class="box3">Box3</div>
		<div class="box4">Box4</div>
	</div>
	<div class="push"></div>
</div>
        <div class="footer">
            <p>Copyright (c) 2008</p>
        </div>
</body>

CSS

* {
margin: 0;
}
html, body {
height: 100%;
}
.wrapper {
min-height: 100%;
height: auto !important;
height: 100%;
margin: 0 auto -4em;
}
footer {
	background-color: rgb(47, 67, 84);
	color:#FFF;
	height:100%;
}
footer, .push {
height: 4em;
}
.span6 {
	float:left;
	height:100%;
}
.box2 {
	border:1px solid;
	clear:both;
	height:100%;
}
.box4 {
	border:1px solid;
	clear:both;
	height:100%;
}