import seaborn as sns
import pandas as pd
import matplotlib.pyplot as plt

data = {
    'A': [1, 2, 3],
    'B': [4, 5, 6],
    'C': [7, 8, 9]
}
df = pd.DataFrame(data, index=['X', 'Y', 'Z'])

plt.figure(figsize=(10, 8))
sns.heatmap(df, annot=True, cmap='coolwarm', linewidths=.5)
plt.show()