#custom-alert {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  padding: 40px;
  font-size: 24px;
  border: 2px solid #000;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0,0,0,0.3);
  z-index: 1000;
  min-width: 300px;
  text-align: center;
  display: none;
}

#close-alert {
  margin-top: 20px;
  padding: 10px 20px;
  font-size: 18px;
  cursor: pointer;
}