invoiceninja/resources/sass/app.scss

@tailwind base;

// ..
@tailwind components;

@import 'components/buttons';
@import 'components/validation';
@import 'components/inputs';
@import 'components/alerts';
@import 'components/badge';

.active-page {
    @apply bg-blue-900 #{!important};
}

// ..
@tailwind utilities;