@import "public.less";   //合并公告样式@boxsize:200px;            //设置变量@boxColor:red;@spanColor:green;@spansize:40px;body,html{    position: relative;}#box{                      //写样式    width: @boxsize;    height: @boxsize;    background: @boxColor;    position: absolute;    top: 0;    left: -@boxsize;    span{                     //子类样式        width: @spansize;        height: @spansize;        background: @spanColor;        position: absolute;        top: 0;        left: 100%;     }}#cover{    width: @spansize;    height: @spansize;    position: absolute;    top: 0;    left: 0;}