CODE EXAMPLE FOR PYTHON

streamlit sidebar width

#This is a workarround
st.markdown(
     """
     <style>
     [data-testid="stSidebar"][aria-expanded="true"] > div:first-child {
         width: 450px;
       }
       [data-testid="stSidebar"][aria-expanded="false"] > div:first-child {
           width: 500px;
           margin-left: -500px;
        }
        </style>
        """,
        unsafe_allow_html=True)