.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
}

.modal.show {
  display: flex;
}

.modal-content {
  width: 100%;
  max-width: 400px;
  position: relative;
}

.close-btn {
  position: absolute;
  top: 15px;
  right: 20px;
  font-size: 24px;
  cursor: pointer;
  color: #888;
}

.input-group {
  margin-bottom: 15px;
}

.input-group label {
  display: block;
  margin-bottom: 5px;
}

.input-group input {
  width: stretch;
  padding: 4px 8px;
}

.submit-btn {
  width: 100%;
}