invalid-tooltip

bootstrap5.css

bootstrap5.css
.input-group > :not(:first-child):not(.dropdown-menu):not(.valid-tooltip):not(.valid-feedback):not(.invalid-tooltip):not(.invalid-feedback) {
  margin-left: -1px;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}
bootstrap5.css
.invalid-tooltip {
  position: absolute;
  top: 100%;
  z-index: 5;
  display: none;
  max-width: 100%;
  padding: 0.25rem 0.5rem;
  margin-top: 0.1rem;
  font-size: 0.875rem;
  color: #fff;
  background-color: rgba(220, 53, 69, 0.9);
  border-radius: 0.25rem;
}
bootstrap5.css
.was-validated :invalid ~ .invalid-feedback,
.was-validated :invalid ~ .invalid-tooltip,
.is-invalid ~ .invalid-feedback,
.is-invalid ~ .invalid-tooltip {
  display: block;
}