1.arrow-down {
2 width: 0;
3 height: 0;
4 border-left: 75px solid transparent;
5 border-right: 75px solid transparent;
6 border-top: 75px solid #f00;
7}
1.arrow-left {
2 width: 0;
3 height: 0;
4 border-top: 60px solid transparent;
5 border-bottom: 60px solid transparent;
6 border-right: 60px solid blue;
7}
1.arrow-right {
2 width: 0;
3 height: 0;
4 border-top: 60px solid transparent;
5 border-bottom: 60px solid transparent;
6 border-left: 60px solid green;
7}
1.arrow-up {
2 width: 0;
3 height: 0;
4 border-left: 75px solid transparent;
5 border-right: 75px solid transparent;
6 border-bottom: 75px solid #761E9B;
7}