ax.add_patch(
    patches.Rectangle(
        (0.4, 0.65),   # (x,y)
        0.2,          # width
        0.2,          # height
        facecolor="#B2D4C4",
    )
)

ax.add_patch(
    patches.Rectangle(
        (0.65, 0.15),   # (x,y)
        0.2,          # width
        0.2,          # height
        facecolor="#00713D",
    )
)
