JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div id="niveau1">
        <div id="niveau2">
            <div id="niveau3">
                <div id="niveau4">
                    <div id="niveau5">
                        <div id="niveau6">
                            <div id="niveau7">
                                <div id="niveau8">
                                    <div id="niveau9">
                                        <div id="niveau10" style="background-color: red">
                                            Test
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</body>

CSS

body div#niveau1 div#niveau2 div#niveau3 div#niveau4 div#niveau5 div#niveau6 div#niveau7 div#niveau8 div#niveau9 div#niveau10{
    background-color: green;
    color:blue;
}