mui-badge-danger/mui-badge-red

Mui.css （v3.0.0）部分源码：

1815
.mui-badge-danger, .mui-badge-red
{
    color: #fff;
    background-color: #dd524d;
}
.mui-badge-danger.mui-badge-inverted, .mui-badge-red.mui-badge-inverted
{
    color: #dd524d;
    background-color: transparent;
}