Hide Div With Opacity Transition

Hide div with CSS and disable mouse events

HTML

<div id="minhaId">
  <h1>Hello, World!</h1>
  <h2>Howdy?</h2>
</div>
<button onclick="ocultar()">Hide</button>
<button onclick="mostrar()">Show</button>

CSS

div {
  display: block;
  opacity: 1;
  transition: display .5s linear;
}

div.hide {
  display: none;
  opacity: 0;
}

#minhaId {
  margin: 0 auto;
  width: 80%;
  box-shadow: 0 0 10px grey;
  padding: 20px;
  box-sizing: border-box;
  border-radius: 5px;
  font-family: sans-serif;
  text-align: center;
}

button {
  width: 100%;
  padding: 5px;
  margin: 10px auto;
  width: 80%;
  display: block;
}

JavaScript

function ocultar() {
  var element = document.getElementById("minhaId");
  element.classList.add("hide");
}

function mostrar() {
  var element = document.getElementById("minhaId");
  element.classList.remove("hide");
}