JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="ru">
    <head>
        <title>Испытание: строим сетку</title>
        <meta charset="utf-8">
    </head>
    <body>
        <div class="conteiner">
            <div class="header-all">
                <div class="header">Header</div>
                <div class="menu">Menu</div>
                    <div class="promo">
                      <div class="promo1">Promo 1</div>
                      <div class="promo2">Promo 2</div>
                    </div>
            </div>
            <div class="content">
                <div class="left">Left</div>
                <div class="main">Main</div>
                <div class="right">Right</div>
            </div>
            <div class="footer">
                Footer
            </div>
        </div>
    </body>
</html>