Changing Title Color for Specific Titles

Hi, first of thanks for the great plugin!

Some context for the question:
I’m developing locally.
I’m using the theme: Sydney with a child-theme.
The webpage is one-paged.
I’m new to wp and html/css.

The question:
I want to change a title color from the widget-title class. However, I can’t locate the code in order to so.

When I inspect the title in Chrome, it looks like the color is hard-coded into to a html-file. I’ve also tried to look for it in style.css and index.html without any luck.

Here is the code for the title (copied from Chrome’s inspect function):
Seneste arbejde

If you could tell me where to find the above snippet, I would be very grateful!

Also, if the code I’m editing is in the html-file, would it be possible to override it in my child-theme to prevent it from getting reset after an update, or can it only be edited in the parent theme?

Best regards,
Daniel