How to custom CSS in drupal 8 Evolve subtheme?

I created a file custom.css in /themes/evolve_sub/assets/css/ and I added in /themes/evolve_sub/

css: - assets/css/custom.css

what is wrong?

(This article is only for drupal7?)

Hi Laura Scevaroli,

We added custom.less file in evolve_sub/assets/lessc folder already. You can add your custom css to that file.