CSS-Tooltip-arrow 绘制三角形

 1 .trangle {
 2     width: 0;
 3     border-color: transparent;
 4     border-style: solid;
 5     background-color: #fff;
 6     border: 19px solid #666;
 7 }
 8 .trangle-up {
 9     border-width: 0 19px 35px;
10     border-bottom-color: #333333;
11 }
12 .trangle-down {
13     border-width: 35px 19px 0;
14     border-top-color: #333333;
15 }
16 .trangle-left {
17     border-width: 19px 35px 19px 0;
18     border-right-color: #333333;
19 }
20 .trangle-right {
21     border-width: 19px 0 19px 35px;
22     border-left-color: #333333;
23 }