from mpl_toolkits.axes_grid1.inset_locator import inset_axes

fig, ax = plt.subplots(figsize=(5,6),dpi=200)

#hiding the axis numbers
ax.axes.xaxis.set_visible(False)
ax.axes.yaxis.set_visible(False)

#setting the axis dimensions
ax.set_xlim((-250, 250))
ax.set_ylim((422.5, -47.5))

#setting the background color as black ('k') for a better visualization
ax.set_facecolor('k')
fig.set_facecolor('k')

cbaxes = inset_axes(ax, width="5%",  
               height="50%", 
               loc='lower left',
               bbox_to_anchor=(.7, 0.07, 5, .08),
               bbox_transform=ax.transAxes,
               borderpad=0,
               )
bar_palette = mpl.cm.inferno
bar = mpl.colorbar.ColorbarBase(cbaxes, cmap=bar_palette, orientation='horizontal')

# creating ticks 
bar.set_ticks([0,1])
bar.set_ticklabels(ticklabels=['Low', 'High'], color='white')