mui-btn-negative/mui-btn-danger/mui-btn-red

Mui.css （v3.0.0）部分源码：

1278
.mui-btn-negative, .mui-btn-danger, .mui-btn-red
{
    color: #fff;
    border: 1px solid #dd524d;
    background-color: #dd524d;
}
.mui-btn-negative:enabled:active, .mui-btn-negative.mui-active:enabled, .mui-btn-danger:enabled:active, .mui-btn-danger.mui-active:enabled, .mui-btn-red:enabled:active, .mui-btn-red.mui-active:enabled
{
    color: #fff;
    border: 1px solid #cf2d28;
    background-color: #cf2d28;
}