code: def highlight_edges(graph: BELGraph, edges=None, color: Optional[str]=None) -> None:
      
      color = color or EDGE_HIGHLIGHT_DEFAULT_COLOR
      for u, v, k, d in edges if edges is not None else graph.edges(keys=True, data=True):
          graph[u][v][k][EDGE_HIGHLIGHT] = color
docs: Adds a highlight tag to the given edges.
  
      :param graph: A BEL graph
      :param edges: The edges (4-tuples of u, v, k, d) to add a highlight tag on
      :type edges: iter[tuple]
      :param str color: The color to highlight (use something that works with CSS)