CodePen Embed - Esempio Classi CSS con JavaScript

<button id="bottone">Clicca qui!</button>
<p id="messaggio" class="nascosto">Ciao!</p>

.nascosto {
  display: none;
}

* {
  font-family: sans-serif;
  font-size 18px;
  font-weight: bold;
}

var bottone = document.getElementById('bottone');
var messaggio = document.getElementById('messaggio');

bottone.onclick = function() {
  messaggio.classList.toggle('nascosto');
}

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