css 实现一些图形

#k{
      width: 20px;
      height: 30px;
      border: 40px solid;
      border-color: red green yellow blue;
    }

 1 #talkbubble { 
 2       width: 120px; 
 3       height: 80px; 
 4       background: red; 
 5       position: relative; 
 6       } 
 7       #talkbubble:before { 
 8         content:"";
 9         position: absolute; 
10         right: 100%; 
11         top: 0px; 
12         width: 0; 
13         height: 0; 
14         border-top: 40px solid transparent; 
15         border-right: 80px solid red; 
16         border-bottom: 40px solid transparent; 
17       }
18       #talkbubble:after { 
19         content:"";
20         position: absolute; 
21         left: 100%; 
22         top: 0px; 
23         width: 0; 
24         height: 0; 
25         border-top: 40px solid transparent; 
26         border-left: 80px solid red; 
27         border-bottom: 40px solid transparent; 
28       }