Cover Block Overlay, White P block

Using 5.8.1 with a basic Underscores theme:
when adding the cover block, it automatically adds a 50% opacity to anything put in there, and then the paragraph block goes white on white; removing the opacity default results in not being able to see where the paragraph block entry text is because the text is white and the background is white … how can I change/fix that so the paragraph block, at least, is always black text by default; I tried to change .editor-styles-wrapper in the css and style-editor.css, but it doesn’t seem to do anything
thanks