# Create dropdown list
def crt_ddl(col_name, desc, percent='15%', default='All'):
    list = df[col_name].unique().tolist()
    list.append('All')
    return Dropdown(
        options=list,
        value=default,
        description=f'{desc}: ',
        style={'description_width': 'initial'},
        layout={'width': percent, 'margin': '0 auto'})