muicss_v1.5.1

代码说明：

  umi.css解决web前端页面布局的最后一里路。在对web页面排版布局时，经常有琐碎的细节要另外写样式，umi.css样式库将最常用的碎片样式整合起来，并统一了样式命名规则。(Umi.css solves the last mile of Web front-end layout. In the layout of web pages, there are often trivial details to write styles. The umi.css style library integrates the most common fragment styles together, and unifies the style naming rules.)