Launcher/resources/styles/toolbar.qss

/* Disable default style */
QToolBar {
    margin: 0;
    spacing: 1px;
    background-color: palette(window);
    border: none;
}

QToolBar:top {
    border-bottom: 2px solid palette(mid);
}

QToolBar:bottom {
    border-top: 2px solid palette(mid);
}

QToolBar:left {
    border-right: 2px solid palette(mid);
}

QToolBar:right {
    border-left: 2px solid palette(mid);
}

QToolBar::separator {
    background-color: palette(midlight);
    width: 1px;
    height: 1px;
}

/* Button */
QToolBar QPushButton,
QToolBar QToolButton {
    margin: 0;
    padding: 14px 14px;
    border: none;
    border-radius: 0;
    background-color: palette(button);
    color: palette(button-text);
    font-size: 13px;
    min-height: 28px;
}

QToolBar:left QPushButton,
QToolBar:right QPushButton,
QToolBar:left QToolButton,
QToolBar:right QToolButton {
    padding: 14px 6px;
    min-width: 0;
    border-bottom: 2px solid palette(midlight);
}

QToolBar QPushButton:hover,
QToolBar QToolButton:hover {
    background-color: palette(midlight);
}

QToolBar QPushButton:focus,
QToolBar QToolButton:focus {
    border-bottom: 2px solid #F52761;
}

QToolBar QPushButton:pressed,
QToolBar QToolButton:pressed,
QToolBar QToolButton:checked {
    background-color: palette(dark);
}

QToolBar QPushButton:disabled,
QToolBar QToolButton:disabled {
    color: palette(mid);
}

/* Button margin */

/* Toolbar */
QToolBar::handle:top, QToolBar::handle:bottom {
    border-left: 5px solid palette(midlight);
    width: 5px;
}

/*QToolBar:top {*/
/*    border-bottom: 3px solid palette(midlight);*/
/*}*/

/*QToolBar:bottom {*/
/*    border-top: 3px solid palette(midlight);*/
/*}*/

/*QToolBar:left {*/
/*    border-right: 3px solid palette(midlight);*/
/*}*/

/*QToolBar:right {*/
/*    border-left: 3px solid palette(midlight);*/
/*}*/

QToolBar::handle:right, QToolBar::handle:left {
    border-top: 3px solid palette(midlight);
}