css 五边形,六边形,八边形,需要考虑如下效果如何实现?
<html>
<head>
<style>
.sixedge{
height: 24px;
width: 55px;
position:relative;
background-color: #FFF;
border-top:1px solid green;
border-bottom:1px solid green;
margin-left:40%;
}
.sixedge:after{...