qTox/ui/friendList/friendList.css

QScrollArea {
    background: @themeMedium;
}

QScrollBar:vertical  {
    background: @themeMedium;
    width: 16px;
    padding: 0px 3px 0px 3px; 
}

QScrollBar:handle:vertical  {
    background: @themeDark;
    min-height: 20px;
    border-radius: 5px;
    margin: 3px 0px 3px 0px;
}

QScrollBar:handle:vertical:hover  {
    background: @themeMediumDark;
}

QScrollBar:handle:vertical:pressed  {
    background: @themeDark;
}

QScrollBar:add-line:vertical {height: 0px;subcontrol-position: bottom;subcontrol-origin: margin;}

QScrollBar:sub-line:vertical {height: 0px;subcontrol-position: top;subcontrol-origin: margin;}
 
QScrollBar:add-page:vertical, QScrollBar::sub-page:vertical  {
    background: none;
}