invoiceninja/resources/sass/components/alerts.scss

.alert {
    @apply bg-gray-100 py-3 mt-4 px-4 text-sm border-l-2 mt-2 mb-1 bg-gray-100 border-gray-400;
}

.alert-success {
    @apply border-green-500;
}

.alert-failure {
    @apply border-red-500;
}