style.css

/* statusbar */

QStatusBar QToolBar {
    padding:0;
    spacing:0;
    margin:0;
    border:0;
}

QStatusBar QToolBar QToolButton {
    padding:0;
    spacing:0;
    margin:0;
}

QStatusBar QToolButton::menu-indicator {
    image: none;
}

/* Regions */

RegionsView QPushButton[regionId] {
    margin: 5px;
    padding: 7px 10px;
    text-align: left;
    vertical-align: middle;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: 5px;
}

RegionsView QPushButton[regionId=""] {

}

RegionsView QPushButton[regionId]:hover {
    border: 1px solid rgba(0,0,0,32);
    background: rgba(0,0,0,16);
}

RegionsView QPushButton[regionId]:focus {
    border: 1px solid palette(highlight);
    background: rgba(0,0,0,16);
}

RegionsView QPushButton[regionId]:checked {
    color: #fff;
    border: 1px solid rgba(0,0,0,64);
    background: qradialgradient(cx: 0.5, cy: 0,
    fx: 0.5, fy: 0,
    radius: 1.35, stop: 0 rgba(0,0,0,128), stop: 1 rgba(0,0,0,64));
}

/* Sidebar */

SidebarHeader {
    background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                         stop: 0 #262626, stop: 1 #3c3c3c);
    padding: 0;
    margin: 0;
    spacing: 0;
    border-bottom: 1px solid black;
}

SidebarHeader QToolButton {
    border: 0;
    padding: 0;
    margin: 0;
    spacing: 0;
    height: 20;
    width: 24;
}

SidebarHeader QPushButton {
    background: transparent;
    color: #fff;
    text-align: center;
}

SidebarHeader QComboBox::drop-down {
    width: 0;
    border-style: none;
}

QLabel[recentHeader="true"] {
    color: rgba(0,0,0,128);
}