用css制作三角形

<div class="triangle_up"></div>

.triangle_up {

0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-bottom:4px solid #ca0309;

border-left:4px solid #fff;border-right:4px solid #fff;

}

//IE6不支持transparent

原文地址:https://www.cnblogs.com/toodeep/p/4337342.html