JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<div class="row">
    <div class="containing col-xs-6 col-sm-6 col-md-3 col-lg-3">
        <div class="row">
            <div class="a col-xs-12 col-sm-12 col-md-6 col-lg-6 col-md-offset-6 col-lg-offset-6">Content of A</div>
            <div class="b col-xs-12 col-sm-12 col-md-6 col-lg-6">Content of B</div>
            <div class="c col-xs-12 col-sm-12 col-md-6 col-lg-6 col-md-offset-6 col-lg-offset-6">Content of C</div>
        </div>
    </div>
</div>

CSS

.containing {
    background-color: aliceblue;
    box-sizing: border-box;
    border: 1px solid #ccc;
}
.a, .b, .c {
    background-color: white;
    box-sizing: border-box;
    border: 1px solid #ccc;
}
.b {
    float: left;
    width: 50%;
    height: 100px;
}
.a, .c {
    float: right;
    width: 50%;   
    height: 50px;
}