.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; width: 100vw; height: 100vh;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
}

.modal-content {
  display: none;
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: #fff;
  padding: 2em;
  border-radius: 8px;
  z-index: 1001;
  min-width: 300px;
}

.modal-close {
  margin-top: 1em;
  display: block;
}