.invalid-input {
  width: 100%;
  margin-top: 0.25rem;
  font-size: .875em;
  color: #dc3545;
}

.loading {
  z-index: 1000;
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
  background-color: rgba(52,58,64,.8);
}

.center {
  text-align: center;
  top: 50%;
  position: relative;
}