JSFiddle - React, Tailwind, and code Playground

HTML

<div class="spoiler">
    <input id="spoiler" type="checkbox">
    <label for="spoiler">Anzeigen</label>
    <p>Versteckter Text</p>
</div>

CSS

.spoiler>input,
.spoiler>p {
    display:none;
}

.spoiler>input:checked ~ p {
    display:block;
}