.modal {
  display: none; 
  position: fixed; 
  z-index: 1000; 
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.6);
}

.modal-content {
  background: #fff;
  margin: 10% auto;
  padding: 20px;
  width: 90%;
  max-width: 500px;
  border-radius: 8px;
  position: relative;
}

.close {
  position: absolute;
  right: 15px;
  top: 10px;
  font-size: 24px;
  cursor: pointer;
}