Text color problem on Black Pro pre-built theme

Hi, after I install the Black Pro pre-built with content, nothing happened. The background color is nearly black and the text color is white.

But when I write my own post with Gutenberg editor, the text color (including post title, content, …) has a black color similar to the website background color.
Link: https://pyzone.dev/start/

I have not added any extra custom CSS. So please help me find out this problem, thank you.

Update #1: The problem also appears when using the classic editor.

• This topic was modified 4 years by nguyenvanhieuvn.

Thank you for your support. As your guide, I found that I changed the default post template (site wide) in Theme Panel > Post settings from Single template to Default. After changing back to “Single template”, Now it’s ok with text content. But the title (h2-h6) is still black as the background color. You can see it here: https://pyzone.dev/start/

I have looked at your demo at https://demo.tagdiv.com/newspaper_black_pro/ and don’t see any heading on your posts.

Update: The image caption also has this issue.

Thank you,
Now I got how to fix it, and also how to customize it with any other color value.