In the documents side panel, when the user has a bunch of files open. The documents panel has this gradient effect, recently clicked/opened files are more highlighted than older files It seems to fade out until there's no more highlight.

Problem is that the highlight color of the gradient(not the current document, but previous document, and the one before that) seems to be hardcoded to bright blue. This is a problem when the dark theme sets text to be white on a dark background. Net result is the text is unreadable.

Reproducible: Always

Steps to Reproduce:
1. Use a dark kde color theme, like obsidian coast
2. Open a bunch of files
3. Click between them in the document viewer

Actual Results:  
Recently clicked document have this bright blue background that makes the white text hard to read.

Expected Results:  
The background should follow theme settings and be visible in a dark theme