Do the letters have white color?
No, the letters are black.
    src        edge_attr  dst
0     0   to the left of   23
1     0   to the left of   10
2     0   to the left of    9
3     0   to the left of   20
4     0   to the left of   13
..  ...              ...  ...
68   23   to the left of    9
69   23   to the left of    1
70   23  to the right of    0
71   23   to the left of   13
72   23  to the right of   22

[73 rows x 3 columns]