三角形(css3)

 1 .userCard .sanjiao {//三角形的制作;
 2      0;
 3     height: 0;
 4     border-left: 10px solid transparent;
 5     border-right: 10px solid transparent;
 6     border-bottom: 10px solid rgba(0, 0, 0, .9);
 7     margin: -23px 0 0 -10px;
 8     left: 50%;
 9     position: absolute
10 }
原文地址:https://www.cnblogs.com/yangguoe/p/9531219.html