JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<div class="container-fluid">
    <div class="row top-row">
        <div class="col-xs-3 top-left">

        </div>
        <div class="col-xs-9 top-right">

        </div>
    </div>
    <div class="row bottom-row">
        <div class="col-xs-3 bottom-left">

        </div>
        <div class="col-xs-9 bottom-right">

        </div>        
    </div>
</div>

CSS

.top-row{
    height:30vh;
}
.bottom-row{
    height:70vh;
}
.top-row > div, .bottom-row > div{
    height:100%;
}

.top-left{
    background:#ff9090;
}
.top-right{
    background:#d6d6d6;
}
.bottom-left{
    background:#e44339;
}
.bottom-right{
    background:#f5f5f5;
}