Qt-Advanced-Docking-System/src/stylesheets/default.css

/*
 * Default style sheet on Windows Platforms
 * Note: Always use CSS-classes with and without "ads--" namespace to support Qt4 & Qt5
 */

ads--CDockContainerWidget
{
    background: palette(dark);
}


ads--CDockAreaWidget
{
    background: palette(window);
    border: 1px solid white;
}

ads--CDockAreaWidget #tabsMenuButton::menu-indicator
{
    image: none;
}


ads--CDockWidgetTab
{
    background: palette(window);
    border-color: palette(light);
    border-style: solid;
    border-width: 0 1px 0 0;
    padding: 0 0px;
}

ads--CDockWidgetTab[activeTab="true"]
{
    background: qlineargradient(spread:pad, x1:0, y1:0, x2:0, y2:0.5, stop:0 palette(window), stop:1 palette(light));
    /*background: palette(highlight);*/
}

ads--CDockWidgetTab QLabel
{
    color: palette(dark);
}

ads--CDockWidgetTab[activeTab="true"] QLabel
{
    color: palette(foreground);
}

ads--CDockWidget
{
    background: palette(light);
    border-color: palette(light);
    border-style: solid;
    border-width: 1px 0 0 0;
}

ads--CTitleBarButton
{
	padding: 0px 0px;
}


QScrollArea#dockWidgetScrollArea
{
	padding: 0px;
	border: none;
}


#tabCloseButton
{
	margin-top: 2px;
	background: none;
	border: none;
	padding: 0px -2px;
}

#tabCloseButton:hover
{
	/*border: 1px solid rgba(0, 0, 0, 32);*/
	background: rgba(0, 0, 0, 24);
}

#tabCloseButton:pressed
{
	background: rgba(0, 0, 0, 48);
}

#tabCloseButton
{
	qproperty-icon: url(:/ads/images/close-button.svg);
	qproperty-iconSize: 16px;
}


ads--CDockSplitter::handle
{
    background-color: palette(dark);
    /* uncomment the following line if you would like to change the size of
       the splitter handles */
    /* height: 1px; */
}


/* Focus related styling */
ads--CDockWidgetTab[focused="true"]
{
    background: palette(highlight);
    border-color: palette(highlight);
}

ads--CDockWidgetTab[focused="true"] > #tabCloseButton
{
	qproperty-icon: url(:/ads/images/close-button-focused.svg)
}



ads--CDockWidgetTab[focused="true"] > #tabCloseButton:hover
{
	background: rgba(255, 255, 255, 48);
}


ads--CDockWidgetTab[focused="true"] > #tabCloseButton:pressed
{
	background: rgba(255, 255, 255, 92);
}


ads--CDockWidgetTab[focused="true"] QLabel
{
    color: palette(light);
}


ads--CDockAreaTitleBar
{
	background: transparent;
	border-bottom: 2px solid palette(light);
	padding-bottom: 0px;
}

ads--CDockAreaWidget[focused="true"] ads--CDockAreaTitleBar
{
	background: transparent;
	border-bottom: 2px solid palette(highlight);
	padding-bottom: 0px;
}