mapper = LinearColorMapper(palette=Magma256, high=df_complete.score.max(), low=df_complete.score.min())

TOOLS = "hover, save, pan, box_zoom, undo, redo, reset, wheel_zoom"

p = figure(title="Heatmap of Sites", x_range=Position, y_range=Values,
           x_axis_location="above", plot_width=900, plot_height=400,
           tools=TOOLS, toolbar_location='below',
           tooltips=[('Position','@Position'),('Score', '@score'), ('Sequence', '@Sequence')])

p.grid.grid_line_color = None
p.axis.axis_line_color = None
p.axis.major_tick_line_color = None
p.axis.major_label_text_font_size = "8pt"
p.axis.major_label_standoff = 0
p.xaxis.major_label_orientation = pi / 3
p.xaxis.ticker = ContinuousTicker(desired_num_ticks = 50) ###

p.rect(x="Position", y="Values", width=1, height=1,
       source=df_complete,
       fill_color={'field':'score', 'transform' : mapper},
       line_color=None)

color_bar = ColorBar(color_mapper=mapper, major_label_text_font_size="8pt",
                     ticker=BasicTicker(),
                     label_standoff=6, border_line_color=None, location=(0, 0))

p.add_layout(color_bar, 'right')
show(p)