QCheckBox改变勾选框大小

QCheckBox{  color: white; }
QCheckBox{ background:transparent}
                             QCheckBox::indicator {width: 40px; height: 40px; }
                             QCheckBox::indicator:unchecked{background:#EEE8CD}
                             QCheckBox::indicator:checked{background:url(:/style/ui_image/dg.png)}