.popup {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: white;
  padding: 20px;
  border: 2px solid #ccc;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  border-radius: 10px;
}
.overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
}
.close-btn {
  float: right;
  cursor: pointer;
  font-size: 18px;
}