body {
  font-family: Arial, sans-serif;
  background-color: #333;
  margin: 0;
  padding: 1em;
  color: #fafafa;
}
.hide {
  display: none;
}
.icon {
  height: 10em;
  margin: 1em 0;
  vertical-align: middle;
  cursor: pointer;
  transition: box-shadow 0.3s ease;
}

.copied {
  box-shadow: 0 0 #555;
  transition: box-shadow 0.3s ease;
  background-color: #555;
}