QScrollBar { background: transparent; }

QScrollBar:vertical { max-width: 8px; }
QScrollBar:horizontal { max-height: 8px; }

QScrollBar::handle {
  padding: 0;
  margin: 2px;
  border-radius: 2px;
  border: 0;
  background: rgba(127, 127, 127, .5);
  min-height: 20px;
  min-width: 20px;
}
QScrollBar::handle:hover { background: rgba(127, 127, 127, 1); }
QScrollBar::handle:pressed { background: palette(highlight); }

QScrollBar::add-line , QScrollBar::sub-line {
  height: 0;
  border: 0;
}

QScrollBar::up-arrow, QScrollBar::down-arrow {
  border: 0;
  width: 0;
  height: 0;
}

QScrollBar::add-page, QScrollBar::sub-page { background: none; }