Mako Top Level Lookup Exception

Question

I have to include css in my mako template. I tried this sample code but I am getting this error, I dont know why?

line 262, in get_template raise exceptions.TopLevelLookupException( mako.exceptions.TopLevelLookupException: Cant locate template for uri 'table_design'

lookup = TemplateLookup(directories=['.', '/Programs/Python/Python39/templates'])

try:
    template = lookup.get_template('table_design.css')
    print(template.render())
except:
    print(exceptions.text_error_template().render())