[Python] How to change color in grouped plotly bar plot

import plotly.express as px
import pandas as pd


data_media_pH = pd.DataFrame([[8.33, 8.36, 8.36], [8.21, 8.18, 8.21], [7.50, 7.56, 7.64]], index=["4 °C", "37 °C", "37 °C + 5 % CO<sub>2"])


fig_media_pH = px.bar(data_media_pH, barmode="group", color_discrete_sequence=["black"]*3)


# Adjust layout

fig_media_pH = fig_media_pH.update_layout(
showlegend=False,
xaxis_title_text=None,
yaxis_title_text="pH",
width=900,
height=800,
margin=dict(t=0, b=0, l=0, r=0),
yaxis_range=(6.5, 8.6)
)

fig_media_pH


I would like to make each group a different color. Is it possible? I can only change color of everything or of first/second/third column in each group, but not just one group.

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