.overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background: rgba(0,0,0,0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.modal-box {
  background: #fff;
  padding: 30px;
  border-radius: 10px;
  width: 60%;
  box-shadow: 0 0 20px rgba(0,0,0,0.3);
  text-align: center;
  position: relative;
}

.close-btn {
  position: absolute;
  top: 10px;
  right: 15px;
  background: #d33;
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 6px 12px;
  font-weight: bold;
  cursor: pointer;
}