JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head>
    </head>
    <body>
        <div id="btnClick" class="clickable">Нажми!</div>
    </body>
</html>

CSS

.clickable{
    min-width: 90;
    min-height: 30;
    border: solid gray 1px;
    text-align:center;
    vertical-align:middle;
}

JavaScript

var btn = document.getElementById('btnClick');
    var message = 'Кнопка нажата!';
    if(btn){
        btn.onclick = function(event){
            alert(message);
        }
    }