JSFiddle - React, Tailwind, and code Playground

HTML

<div class="spoiler">    
    <label class="btn" for="spoiler_1">СПОЙЛЕР</label>
    <input type="checkbox" id="spoiler_1"/>
    <div class="text">
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Amet aspernatur dolorem ducimus eaque! 
        Alias assumenda, blanditiis dignissimos facilis fuga ipsam molestias necessitatibus nostrum numquam
        raesentium quo sed sit! Aut, vitae?
    </div>
</div>

CSS

.btn {
    display: inline-block;
    border: none;
    border-radius: 4px;
    font-size: 22px;
    padding: 10px 20px;
    background: #558ed6;
    color: #fff;
    font-family: Tahoma, sans-serif;
    cursor: pointer;
}

.spoiler input[type=checkbox] {
    display: none;
}

.text {
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 4px;
    margin: 12px 0 20px;
}

.spoiler input[type=checkbox] + .text {
    display: none;
}

.spoiler input[type=checkbox]:checked + .text {
    display: block;
}