What is the color of the dome?
The dome is light blue.
    src  edge_attr  dst
0     1         on    8
1     2         of    8
2     3      below    9
3     3      below    0
4     5         of    3
5     6     around    9
6     8         on    2
7     8         on    9
8     8         on    3
9     9  on top of    3
10   10         on    3
11   10         on    9