JSFiddle - React, Tailwind, and code Playground

HTML

<p id="hidden">Бебебебебебебебебебебебебебебебебеббебебеббебеб</p>

CSS

p#hidden {
    background:greenyellow;
    padding:10px;
    text-align:center;
    width:300px;
    display:block;
    margin: 0 auto;
    word-wrap:break-word;
    display:none;
}

JavaScript

function show_hidden_content() {
    
    var d = document;
    d.getElementById('hidden').style.display = 'block';
    
}

setTimeout(show_hidden_content, 3000);