mui-btn-positive/mui-btn-success/mui-btn-green

Mui.css （v3.0.0）部分源码：

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.mui-btn-positive, .mui-btn-success, .mui-btn-green
{
    color: #fff;
    border: 1px solid #4cd964;
    background-color: #4cd964;
}
.mui-btn-positive:enabled:active, .mui-btn-positive.mui-active:enabled, .mui-btn-success:enabled:active, .mui-btn-success.mui-active:enabled, .mui-btn-green:enabled:active, .mui-btn-green.mui-active:enabled
{
    color: #fff;
    border: 1px solid #2ac845;
    background-color: #2ac845;
}