Untitled

<body>
<button onclick="highlight('Invisible-Button')">Remove the invisibility</button>
<button id="Invisible-Button">Invisible Button</button>
<p class="invisible-text" id="Numero">0</p>
<script>
function highlight('Invisible-Button') {
document.getElementById('Invisible-Button').style.background="color blue";
}
</script>
<style>
    #Invisible-Button {
      color: blue; background-color: red; border-color: black; cursor: default;
    }
</style>
</body>