rssguard/resources/skins/nudus-light/qt_style.qss

QPlainTextEdit:focus {
    border: 1px solid palette(highlight);
}

QSplitter::handle {
  background: palette(dark);
}

/*
 * For `qt5-styleplugins`: motif, cde, gtk2, etc.
 */
QStatusBar::item {
    border: none;
}