body{
  background: lightgray;
  font-family: sans-serif;
  font-size: 20px;
}

.click{
  color: blue;
  cursor: pointer;
  text-transform: uppercase;
}

.apparition{
  display: none;
  text-transform: uppercase;
  font-size: 40px;
  color: yellow;
  border: 1px solid yellow;
  padding: 20px;
  text-align: center;
}