JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row multi-columns-row kwayy-items-wrapper">
        <div class=
        "kwayy-testimonial-box col-lg-4 col-sm-6 col-md-4 col-xs-12">
            <div class="kwayy-testimonial-data">
                <blockquote class="kwayy-testimonial-text">
                    <div class="contarea">
                        <div class="kwayy-tst-contarea-text">
                            <h2 style="text-align: center;">one</h2>

                            <h4>first box</h4>Lorem ipsum dolor sit amet,
                            consectetur adipiscing elit.
                        </div>
                    </div>

                    <footer>
                        <span class=
                        "kwayy-testimonial-icon kwicon-fa-quote-left" style=
                        "font-style: italic"></span> <cite class=
                        "kwayy-testimonial-title"></cite>
                    </footer>
                </blockquote>
            </div>
        </div>

        <div class=
        "kwayy-testimonial-box col-lg-4 col-sm-6 col-md-4 col-xs-12">
            <div class="kwayy-testimonial-data">
                <blockquote class="kwayy-testimonial-text">
                    <div class="contarea">
                        <div class="kwayy-tst-contarea-text">
                            <h2 style="text-align: center;">two</h2>

                            <h4>second box</h4>Lorem ipsum dolor sit amet,
                            consectetur adipiscing elit.
                        </div>
                    </div>

                    <footer>
                        <span class=
                        "kwayy-testimonial-icon kwicon-fa-quote-left" style=
                        "font-style: italic"></span> <cite class=
                        "kwayy-testimonial-title"></cite>
                    </footer>
                </blockquote>
            </div>
        </div>

        <div class=
        "kwayy-testimonial-box col-lg-4 col-sm-6 col-md-4...

CSS

.row.multi-columns-row.kwayy-items-wrapper:nth-child(1) .contarea {
    background-color:#555;
}
.contarea {
    border:3px solid #333;
}