.lanren{width: 66px;height: 120px;margin:100px auto;background-color: #008000;position: relative;}
.lanren::before{content:"";width: 0;height: 0;position:absolute;left:-35px;top:0;border-right:35px solid #008000;border-top:60px solid transparent;border-bottom:60px solid transparent;}
.lanren::after{content:"";width: 0;height: 0;position:absolute;right:-35px;top:0;border-left:35px solid #008000;border-top:60px solid transparent;border-bottom:60px solid transparent;}

/* 代码原创：时代Java NowJava.com */

.lanren2{width: 66px;height: 120px;margin:100px auto;background-color: red;position: relative;}
.lanren2 .left{width: 0;height: 0;position:absolute;left:-35px;top:0;border-right:35px solid red;border-top:60px solid transparent;border-bottom:60px solid transparent;}
.lanren2 .right{width: 0;height: 0;position:absolute;right:-35px;top:0;border-left:35px solid red;border-top:60px solid transparent;border-bottom:60px solid transparent;}