How to use custom_css in ag-grid tables?

Hello I am using ag-grid package to show my dataframe in Streamlit app

Can you please guide us, how we can add custom_css to the ag-grid tables ?
Ex - I want to change ‘blue’ color to the ‘red’ in ag-grid table, I tried the following code, but it didn’t

gb = GridOptionsBuilder.from_dataframe(df)
grid_options =
grid_return = AgGrid(df,
custom_css= {‘background-color’: ‘#ff0000’}

st.markdown(‘{background-color: #ff0000;}’, unsafe_allow_html=True)

Can you please suggest the correct way to change the existing theme color ?
Thank in advance

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