editor-styles.css not working

(I added atomic blocks in order to have the container function.

The absolutely horrible functionality problem with this is that there is absolutely no padding between the container block and the blocks inside. Which means that it’s practically impossible to select the correct block you want to edit.)

A natural solution would be to edit the editor-styles.css.

So I created the file editor-styles.css and added add_editor_style();

But the css isn’t appearing in the editor.

What am I missing?