.hidden {
  display: none;
}

.visible {
  position: absolute;
  z-index: 10;
  left: 50%;
  top: 50%;
  width: 450px;
  transform: translate(-50%, -50%);

  background: rgba(128,128,128,0.9);
  border-radius: 10px;
  text-align: center;
  padding: 50px;
  border: solid 1px #333;
  box-shadow: rgba(0,0,0,0.5) 5px 5px 10px;
}

.label {
  display: block;
  font-weight: bolder;
  color: white;
  font-size: 25px;
  margin-top: 30px;
}