example dark style sheet

src/sampleconf/recoll-dark.qss

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+/* 
+ Embryonic dark mode
+
+ If you do want to use and improve it, and encounter a difficulty due to
+ (lack of) widget object names or whatever, please get in touch, I'll fix
+ what needs to be.
+
+ You can have a look at http://doc.qt.io/qt-5/stylesheet-syntax.html 
+ for Qt style sheet information.
+
+ Select the file from the GUI with:
+   Preferences->GUI configuration->User interface->Style sheet->Choose
+
+ You will also need to change the HTML style which controls the
+ result list:
+   Preferences->GUI configuration->Result list->
+                 Edit result page html header insert
+ For example:
+   
+<style type="text/css">
+ html {
+     background-color: #505050;
+     color: #D8D8D8;
+     selection-background-color: #424e72;
+ }
+</style> 
+
+*/
+
+
+/* Light on dark text everywhere*/
+* {
+    background-color: #3c3c3c;
+    color: #D8D8D8;
+    selection-background-color: #424e72;
+}
+
+/* Slightly lighter background for text entry areas*/
+QComboBox[editable="true"], QTextEdit, QLineEdit, QTextBrowser, QTableView,
+QWebView, QPlainTextEdit { 
+    background-color: #505050;
+    color: #D8D8D8;
+}