Is the box different in color than the sign?
No, both the box and the sign are black.
    src        edge_attr  dst
0     0  to the right of   25
1     0  to the right of    1
2     1   to the left of    3
3     1   to the left of    0
4     1          holding    3
..  ...              ...  ...
88   30   to the left of   28
89   30               on    6
90   30  to the right of   26
91   31   to the left of   23
92   32   to the left of    5

[93 rows x 3 columns]