My previous thread¹ did not a have good enough picture, so I have done another one.
The CSS is what the HTML version of DDG uses: https://duckduckgo.com/s640.css
I have been using a changed style with a darker background (I have put a version I have made a few weeks ago, and have not changed much since then, in another thread I started here).
There is one thing that I cannot find what to change in the CSS file. This screenshot shows the "white culprit". The arrow and the mouse pointer points it.
Here it is:
(or the attached one, whatever you prefer)