Does the ground have green color?
No, the ground is brown.
   src        edge_attr  dst
0    2  to the right of    7
1    4  to the right of    6
2    5  to the right of    6
3    6   to the left of    4
4    6   to the left of    8
5    6   to the left of    5
6    7   to the left of    2
7    8  to the right of    6