QGroupBox 
{border: 0px solid gray;border-top: 1px solid  rgb(208, 208, 208); margin-top: 0.5em; 
}
QGroupBox::title
{ subcontrol-origin: margin; subcontrol-position: top center; padding: 0 3px; background-color: white;     
}
设置Line
color: rgb(208, 208, 208);