.popup {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  height: 300px;
  background-color: black;
  color: white;
  padding: 20px;
}

.popup .close {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 20px;
  cursor: pointer;
}

.popup .content {
  text-align: center;
}

.popup .content p {
  font-size: 36px;
}

.popup .content .button {
  display: inline-block;
  margin-top: 20px;
  background-color: white;
  color: black;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  text-decoration: none;
  font-size: 24px;
  transition: background-color 0.3s ease;
}

.popup .content .button:hover {
  background-color: gray;
}