QScrollBar:vertical {    background: #444444;    width: 19px;    margin: 20px 0 20px 0;}QScrollBar::handle:vertical {    background: #777777;    border: 1px solid #444444;    border-radius: 2px;    min-height: 19px;}QScrollBar::handle:vertical:hover {    background: #999999;    border: 1px solid #444444;    border-radius: 2px;    min-height: 19px;}QScrollBar::add-line:vertical {    background: #555555;    height: 19px;    subcontrol-position: bottom;    subcontrol-origin: margin;}QScrollBar::sub-line:vertical {    background: #555555;    height: 19px;    subcontrol-position: top;    subcontrol-origin: margin;}QScrollBar::add-page:vertical, QScrollBar::sub-page:vertical {    background: none;}QScrollBar:up-arrow:vertical {    border: 2px solid #444444;    width: 6px;    height: 6px;    background: #666666;}QScrollBar:down-arrow:vertical {    border: 2px solid #444444;    width: 6px;    height: 6px;    background: #666666;}