JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
    <div class="col-xs-12 col-sm-5 col-lg-5">
    <div class="row">
        <div class="col-xs-12 col-sm-12 col-lg-12">
            <div class="col-xs-12 col-sm-6 col-lg-6">
                <div class="section">First div</div>
            </div>

            <div class="col-xs-12 col-sm-6 col-lg-6">
                <div class="section">Second div</div>
            </div>
        </div>
    </div>

    <div class="col-xs-12 col-lg-12">
        <div class="section">Third div</div>
    </div>
</div>

CSS

.row > div {
    margin-bottom: 15px;
    
}

.row > div > div:nth-child(1) {
    margin-bottom: 15px;
    background-color:red    ;
}

.row > div > div:nth-child(2)
{
    background-color:gray;
}