JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">

<div class="row">
    <div class="col-md-4 row-height">
        <span>col-md-4</span>
    </div>
    <div class="col-md-6 row-height">
        col-md-6
    </div>
    <div class="col-md-2 row-height">
        col-md-2
    </div>
</div>

CSS

.row {
    padding: 100px;
}

.row-height {
    height: 70px;
    text-align: center;
    padding-top: 25px;
}

.col-md-4,.col-md-2 {
    background-color: #e3e3e3;
}

.col-md-6 {
    background-color: #f5f3f3;
}

.col-md-4 {
    border-radius: 15px 0 0 15px;
}

.col-md-2 {
    border-radius: 0 15px 15px 0;
}