JSFiddle - React, Tailwind, and code Playground

HTML

<a class="button">Teste 1</a>
<a class="button">Teste 2</a>
<a class="button negado"><span>Teste 3</span></a>
<a class="button">Teste 4</a>

CSS

a.button {
    background:#eee;
    padding:15px;
}

a.button:not(.negado) {
    background:#f0f;
}