JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="block">
        <h2>заголовок</h2>
        <button>кнопка</button>
        <p>текст</p>
    </div>
    <div class="block active">
        <h2>заголовок</h2>
        <button>кнопка</button>
        <p>текст</p>
    </div>
    <div class="block">
        <h2>заголовок</h2>
        <button>кнопка</button>
        <p>текст</p>
    </div>
</div>

CSS

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

.container {
    text-align:center;
    font-size: 0;
}

.block {
    display: inline-block;
    vertical-align: top;
    height: 300px;
    background: #333;
    font-size: 15px;
    color: #fff;
    border: 2px solid #fff;
    width: 25%;
    transition: 0.3s;
}

.container p, .container button {
    display: none;
}

.active {
    width: 50%;
}

.active p, .active button {
    display: inline-block;
}

JavaScript

$( ".block" ).hover(function() {
  $( ".block" ).removeClass("active");
  $( this ).addClass("active");
});