收集css属性.

body:before {
          content: "";
          position: fixed;
          top: -10px;
          left: 0;
          width: 100%;
          height: 10px;
          box-shadow: 0px 0px 10px rgba(0,0,0,.8);
          z-index: 100;
}

浏览器头部阴影不支持ie

 

.clearfix:after {
    clear: both;
    content: ".";
    display: block;
    height: 0;
    visibility: hidden;
}

清除浮动在父元素上使用

 

边框
border-radius: 2px 2px 2px 2px;
box-shadow: 1px 2px 5px #CCCCCC;
border: 1px solid #DDDDDD;