invoiceninja/resources/sass/components/validation.scss

.validation {
    @apply border-l-2 mt-2 mb-1 px-3 bg-gray-100 py-1;
}

.validation-fail {
    @apply border-red-500 text-gray-700 text-sm;
}

.validation-pass {
    @apply border-emerald-500 text-gray-700 text-sm;
}