<｜begin▁of▁sentence｜>### Instruction:
Given a simple tree graph created with igraph's Graph.Tree function with 7 vertices, each having 2 children (creating a binary tree structure), can you create a visualization of the graph where the edges are drawn using a light-to-dark style to indicate the direction, by utilizing the LightToDarkEdgeDrawer in igraph?
### Response:
import igraph
from igraph.drawing import Plot
from igraph.drawing.edge import LightToDarkEdgeDrawer

# Creating a graph
g = igraph.Graph.Tree(7, 2)

# Setting up visual style
visual_style = {}
visual_style['vertex_size'] = 20
visual_style['edge_curved'] = False

# Creating a plot with a light-to-dark edge drawing style
plot = Plot('/path/to/tree.png', bbox=(300, 300), background='white')
ctx = plot.ctx
palette = igraph.drawing.colors.ClusterColoringPalette(20)
plot.add(g, **visual_style, edge_drawer=LightToDarkEdgeDrawer(ctx, palette))
plot.redraw()
plot.save()
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