suyu/dist/qt_themes/default/style.qss

QPushButton#TogglableStatusBarButton {
    color: #959595;
    border: 1px solid transparent;
    background-color: transparent;
    padding: 0px 3px 0px 3px;
    text-align: center;
}

QPushButton#TogglableStatusBarButton:checked {
    color: #000000;
}

QPushButton#TogglableStatusBarButton:hover {
    border: 1px solid #76797C;
}

QPushButton#RendererStatusBarButton {
    color: #656565;
    border: 1px solid transparent;
    background-color: transparent;
    padding: 0px 3px 0px 3px;
    text-align: center;
}

QPushButton#RendererStatusBarButton:hover {
    border: 1px solid #76797C;
}

QPushButton#RendererStatusBarButton:checked {
    color: #e85c00;
}

QPushButton#RendererStatusBarButton:!checked{
    color: #0066ff;
}