What color is the arrow?
The arrow is white.
     src        edge_attr  dst
0      0  to the right of   17
1      0  to the right of   21
2      0               on    2
3      0  to the right of    8
4      0  to the right of    3
..   ...              ...  ...
99    22  to the right of    8
100   22  to the right of    6
101   22  to the right of   13
102   22  to the right of   12
103   22  to the right of    3

[104 rows x 3 columns]