Zubin theme editor-block color ‘white’ makes the title unreadable

Hi Skandha, When I'm posting or editing a page using Wordpress Gutenburg editor, the title on top is set to 'White' which meant that it's unreadable when I'm editing it. The css of that the title is under themes/zubin/assets/css/editor-blocks.css (ver=5.6.2) and I tried to change the colour to black in theme editor, under editor-blocks.css but it doesn't seem to apply. Would you have a look and let me know if it can be fixed? I found a similar problem someone else is having with other Theme on https://generatepress.com/forums/topic/page-title-in-gutenberg-editor-unreadable-due-to-colour/ but I don't know which php I should change and what to reading from that article. Thank you in advance!