What color does the elbow pad in the bottom have?
The elbow pad has black color.
     src        edge_attr  dst
0      0  to the right of   16
1      1  to the right of   23
2      2  to the right of    9
3      2   to the left of    7
4      2   to the left of   25
..   ...              ...  ...
186   28  to the right of   22
187   28  to the right of   25
188   29   to the left of    2
189   29   to the left of   25
190   29   to the left of   22

[191 rows x 3 columns]