JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
<div class="container">
    <div id="column1" class="row col-xs-6 col-sm-8">
        <div id="B" class="col-xs-12 col-sm-6">B</div>
        <div id="logo" class="col-xs-12 col-sm-6">Logo<br/>Logo</div>
    </div>
    <div id="column2" class="row col-xs-6 col-sm-4">
        <div id="A" class="col-xs-12 col-sm-12 ">A</div>
    </div>
</div>

CSS

#logo, #A, #B {
    text-align: center;
    line-height: 50px;
    font-weight: bold;
    color: #FFF;
}

#logo {
    background-color: #A00;
}
#A {
    background-color: #00A;
}
#B {
    background-color: #0A0;
}

JavaScript

$(function() {
    $(window).resize(function() {
        var w = $(window).width();
        if (w < 768 && $('#column1').children().length > 1) {
            $('#B').prependTo( $('#column2') );
        } else if (w > 768 && $('#column2').children().length > 1) {
            $('#B').prependTo( $('#column1') );
        }
    });
});