JSFiddle - React, Tailwind, and code Playground

HTML

<div class="col-lg-5 col-md-5 col-sm-5 col-xs-12 home-person">1</div>
<div class="col-lg-5 col-md-5 col-sm-5 col-xs-12 home-person">2</div>
<div class="col-lg-5 col-md-5 col-sm-5 col-xs-12 home-person">3</div>
<div class="col-lg-5 col-md-5 col-sm-5 col-xs-12 home-person">4</div>

CSS

.przykladowa-klasa{
    color:red;
}

.przykladowa-klasa-2{
    font-size:20px;
}

JavaScript

$(function(){
$('.home-person:first').addClass( "przykladowa-klasa przykladowa-klasa-2" );
});