.popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.popup-content {
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  width: 300px;
  text-align: center;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.25);
  position: relative;
}

.close-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 24px;
  cursor: pointer;
  border: 0;
  background: transparent;
  line-height: 1;
}