1,向上的三角
1
2
3
4
5 border-radius title >
6
7 div{
8 width: 0;
9 height: 0;
10 border-left: 20px solid transparent;
11 border-right: 20px solid transparent;
12 border-bottom: 20px solid #ccc;
13 }
14 style >
15 head >
16
17
18 div >
19 body >
20 html >
2,向下的三角
1
2
3
4
5 border-radius title >
6
7 div{
8 width: 0;
9 height: 0;
10 border-left: 20px solid transparent;
11 border-right: 20px solid transparent;
12 border-top: 20px solid #ccc;
13 }
14 style >
15 head >
16
17
18 div >
19 body >
20