Are the label and the step the same color?
No, the step is black and the label is white.
    src        edge_attr  dst
0     0  to the right of    5
1     0  to the right of    4
2     1   to the left of    7
3     1   to the left of    3
4     2       hanging on    6
5     2               on    6
6     3   to the left of   10
7     3  to the right of    1
8     4   to the left of   12
9     4   to the left of    9
10    4   to the left of    0
11    4   to the left of   11
12    5   to the left of    0
13    5   to the left of    9
14    7   to the left of   10
15    7  to the right of    1
16    8               on    9
17    8   to the left of   10
18    9  to the right of    5
19    9  to the right of    4
20   10  to the right of    3
21   10  to the right of    7
22   10  to the right of    8
23   11  to the right of    4
24   11   to the left of   12
25   12  to the right of    4
26   12  to the right of   11