hockey.python

fig, ax = plt.subplots(figsize=(12,5))

sns.lineplot(x=mbh99['Year'],
...          y=mbh99['Temperature'],
...          color='Black')

ax.axvspan(1000, 1200, alpha=0.25, color='red')
ax.axvspan(1400, 1800, alpha=0.25, color='blue')

ax.set_xlabel('Years')
ax.set_ylabel(r'Global Temperature Anomaly ($\degree$C)')

plt.tight_layout()
plt.show()