.modal {
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: #fefefe;
  margin: auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
  max-width: 400px;
  border-radius: 8px;
  text-align: center;
}

.modal-content h2 {
  margin-top: 0;
}

.modal-content button {
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  background-color: #4CAF50;
  color: white;
  cursor: pointer;
}

.modal-content button:hover {
  background-color: #45a049;
}

.error-message {
    color: red;
    margin-bottom: 15px;
    display: none;
}