QProgressBar::chunk
{
background-color: #d7801a;
width: 2.15px;
margin: 0.5px;
}
daodaoliang Qt常见皮肤qss代码
http://daodaoliang.com/Qt%E5%AD%A6%E4%B9%A0/2014/10/30/Qt%E5%AD%A6%E4%B9%A0-2014-10-30-Qt%E5%B8%B8%E8%A7%81%E7%9A%AE%E8%82%A4%E7%9A%84QSS/
原文：http://www.cnblogs.com/findumars/p/7003220.html